@CovenantSlayer also, ill add you as a contributor, as i had no clue that IgnitionDelay existed until i read this post

@CovenantSlayer Thanks haha, the release date is much closer than you think.

@V The hero we needed but not the one we deserved

@Formula350 I plan on making a huge deal about it on the forums, and will have the mods put it in the useful links post. I already have a release date planned for it

@V Can you please @ me when you post your findings? :)
Also, thanks for taking the time to do so!

@CovenantSlayer just finished off the list itself, im doing the introduction and fact checking now

@V How's that list comin' along?

Hmmm I probably should've tried the thing before I posted. heh
Applying that density variable to a Wing does NOT stick. It was probably removed from the game long ago and is a latent setting they forgot to remove.

@CovenantSlayer It's the same folder that our Planes get saved to.
If you're on PC, copy and paste this into a folder's "address box", or after opening Start Menu:
%USERPROFILE%\AppData\LocalLow\Jundroo\SimplePlanes
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Mac/Linux I dunno, but it's wherever you install Mods to; Mobile, you're on you own lol.
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Unfortunately, as I found out, we CANNOT modify it *sigh*
Or if we can it'll take doing something additional (I don't want ot make it Read-Only, but I will if I have to), but I went through the trouble of adding a whole bunch of "custom" parts to make my life easier, having pre-set XML options, but they didn't take because the file gets reset each game start. :(
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There weren't any other juicy bits in there unfortunately. No disable (hidden) parts, or the like. heh
But if you do take a look and also happen to notice it, I think the Studio related stuff are referring to the image of the Part in the Parts Catalog inside the Designer. (I think internally, the designer is called or referred to as the Studio.)

@Formula350 Might I ask where to find the DesignerParts.xml? Assuming that's a freely accessible file. Might have a few more gems in there I'd love to get my hands on.

Aaannd stumble across ANOTHER one, this time coming out of the DesignerParts.xml...
On the "Vertical Stabilizer" and "Horizontal Stabilizer", in their Wing category, resides this curiosity:
density="5.6"
The Primary, Structural Wing, and Structural Panel all lack it. That would make me think they're using a default value; however, if a part uses a default value that means it does not save it to the plane's XML file.... meaning that this density should show up in them (or through Override).
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At any rate, Googled "what is wing density" and:

Wing density is then simply the aircraft mass m over its wing volume VOLwing. This represents the mean density of the aircraft as if it were compressed into its wing.

(I had to fudge the formatting a bit since the forums doesn't support Subscript, but originally it was "VolWing" and Wing was subscript.)
From this journal/paper via Cambridge.org: "On the wing density and the inflation factor of aircraft"
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Unfortunately that's way out of my league... but, it sounds like POSSIBLY changing it can (if it's still supported in the game) could effect the "Wing Loading" value. And/Or impact the amount of Wing Flex exhibited in Wing-1 (unused part) and Wing-3 parts?? (as a Wing-2 part doesn't exhibit any flexing)

Found another one, NO idea what it does besides being in reference to the rendering system... (if I remember correctly, "Depth Mask" are used for the Lighting on textures, via shading and reflections)
renderQueue set to BeforeDepthMask
Placed right in the main "Part" section.
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So whether there are other choices, or even what. there are for other choices... *shrug*
I suppose it's plausible that there's also an AfterDepthMask option heh
EDIT: Nope, After errors, and reverts it back to "Default", as per the console.
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Found it on the Propeller of the new P-51-D that came with the v1.11 update, so you know it's legitimate! (I suppose the fact the game didn't auto-remove it also make it a bit 'obviously legitimate', too lol)

@Formula350 youre supposed to add a new item to the menu actually

@Formula350 Oh wow, good catch! It looks like you can assign lift force and drag force as variable outputs.. this looks epic!

Waaaaait a second...
I just had a Wing selected and accidentally clicked on its Variables menu -- the one in the "Rotate" menu, as this is key -- and saw that there's a Lift Force and Drag Force?? o_0
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Anyone know how to use those?

@ZeroWithSlashedO @IceCraftGaming Aah ok, so it's just the "Firing Delay" on Rockets, but for the Missiles. Strange that it wasn't in the menu, like it is with Rockets. (Then again, the decision for a LOT of things not being in the menu I've found to be strange, so this is par for the course... lol)
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If I ever decide to make a successor Derpship rocket build, that may come in handy. Though even in my original, I just used the Detatcher to handle all of the timing and staging (ie ignition of the rockets).
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liftScale will be fun, though, and just so happens I threw together a Blended Wing design these last few days which I'm thinking are going to benefit from this, given it's reluctance to stay aloft under 250MPH lol
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Anywho, thanks for the explanations!

Theoretically you could find every attribute in resources.assets file. In archaic versions that’s where you can change the default setting for parts. I recalled changing the engine output there.

@Formula350
ignitionDelay is for missiles. Specifically, it would delay the ignition of the rocket boosters after launch by seconds. This is a great feature for making custom medium-bvr range missiles. Speaking of rocket boosters, I think Rocket Boosters in SP needs to be more solid.

But liftScale? Damn, I didn't know that existed (which I'm sure literally almost everybody also didn't know.), this is great for something like a flat fuselage design which irl, gives more lift.

@Formula350 I think ignition delay is for missiles

I need liftscale lmao

Yes, not providing us with the complete list of functions, to me, is a huge "dropped the ball" situation with the devs :\ Only they have the means to tell us definitively, via their access tot he source.
I also wanted to even offer to pay WNP78 to update Overload so that it would PROVIDE all the available baked in variables and their valid values... but everyone dubbed it a "bribe" for some reason. (Pretty sure most didn't read the entire post, which... it was long, as all mine tend to be...)
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I've never heard of the two you've mentioned, and am keen to play with them now. Though I'll need to know what details you have on ignitionDelay so I can go about utilizing it :P
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All I have to offer is that the main Part variable of partCollisionResponse can be set to None (case sensitive), which seems to basically make parts still collidable BUT immune to taking damage.
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Also that you can change the Airfoil manually to NACAPROP to access the airfoil that is used on Props/Heli Rotors (this may actually be in SimpleCheats). As I'd been told, the difference is that this airfoil has a linear and hard coded stall table that... I guess makes it unable to actually stall? *shrug*
The technicality behind it is beyond me; however, in my experience playing with it I can share that it is poor at producing lift, in that it's very similar in that regard to the "Symmetrical" airfoil but it can handle much greater AoA's, and therefore seems to work really well for fully-moving control surfaces (ie canards).
(Again, poor lifting properties, so for a canard you'd sort of want to make sure your plane flies well without them)

@CovenantSlayer I'm just writing down all the ones I know about + the ones in simplecheats. They will all have brief descriptions on what they do and how they work. Im also asking around for XML properties that aren't normally listed.

@CrimsonOnigiri Discovering lift scale let me design one of my first aircraft that can sustain over 30 degrees AOA.. which I thought was impossible in simpleplanes without the use of mods. It literally changed my (SP) life.

@V You linked the SimpleCheats list i linked in the original post. If you're updating it, I'm curious, how do you go about finding part properties? I've pored through all the possible XML files related to the game but none actually hint at any properties that affect parts.

Sorta, but it's very out of date. I'll probably have to make a new one, since the old one isn't updated anymore.

Link to the list, it is missing Everything past the 1.8 update.