So basically if you make a fuselage tiny enough it will turn into a black hole and swallow your build?

Interesting.

@hpgbproductions I think I follow you.
In which case, no you can't exactly do that..... with Slice alone...
However, Slice and using "Angle", will. As "Angle" can. ""add"" (though it technically may be "stretching", I dunno?)
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That's only IF I'm understanding you. I'm a hands-on learner, so this is what I've come up with after monkeying with it a bit. Let me know if this is what you were trying to achieve?
fillFront = 1,2,1.1
fillBack = 1,0,1,1
inletSlant = -0.5 (aka "Angle" in Part Settings menu)

@Formula350 the shape changes if you try to increase a fill less than 100%, because the mesh exists to 100% fill.
For example, if you have a semicircular line of Top 50% and want to add an angled part to the front, you cannot replace 50% with 200%, because your semicircle would turn into a circle.
If you are panelling with sliced fuselage, you sadly need that one extra part for angling the back.

@hpgbproductions
Do you have an example of fill values?
Because it sounds like what you're saying is similar to what I did in my "Bonus" example at the bottom. Where I cut both Left and Right on the Front and Back:
----------------T | B | L | R
fillFront = 1 | 1 | 0 | 1.2
fillBack = 1 | 1 | 1.25 | 0.5

@BaconEggs lol Thanks
It isn't "over-9000" but I'll still take it! :D

8000 iq post thid cool method make lots of cool stuff

I just tried this recently, it's a neat trick but can't be used if the fuselage is already cut at that side (only 100% fills can be increased further)

@Formula350 Absolutely agreed, the slant stuff is a gamechanger and has always been very helpful when building

@Kangy Yea, for me personally, finding a way to replace the "Angle" / "Inlet Slant" function, is going to be really handy. I won't have to worry as much about if I have a Fuselage the "right way around" in order to use it lol
Though, similarly, being able to adjust where the slice ends, now also means a person doesn't need to use 2 pieces of Fuselage to accomplish that same sort of taper! :D

@AWESOMENESS360 I'm "ok" at building, but am better at finding ways to exploit stuff to do (or look) how it wasn't intended! So the quicker I can figure out ways to manipulate stuff, the quicker the community can come up with ways to use it and make all kinds of... *ahem* awesomeness... with them! lol
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For example, I recently found out that a Sliced in half Inlet, if the middle value of the scale variable is set to -1 (so 1,-1,1; at least in how mine was sliced)... it looks fine in the Designer, but when spawned into the game it sort of turns itself inside-out and looks 2D :}

This is very creative, there’s so much that we can do that has yet to be discovered!

@Formula350 Gah thank you so much mate!
This is really good find!
I'll defs note this down somewhere so that I can use this technique on future builds :)

Now with some basic pics! Whether they help convey what's happening to any appreciable degree, I dunno :}
Having played around with this enough, I can see the difference, but to others it may be like "Uhh... Looks the same?" heh

While making that Bonus, I found out that using even a small amount of Negative on just ONE of the complimentary sides (ie Front and Back, or Left and Right), while the other side uses positives even within vanilla range, can result in the part being Sliced into oblivion (disappears), OR all that remains is a itty bitty sliver of fuselage.
Using the Bonus Example's values, all it takes to 'vanish' is changing the Back's 1.25 into -1.25, and changing it's "Angle" (Slant) to 0%.

@Kangy *grumbles* lol
To really do it proper justice that'd need a lot of images, and, ideally they'd have to be also GIF to show the transition from original to modified. And while a few static images would be doable, I don't have the monthly bandwidth to tackle uploading a bunch of GIFs :( (Blame corporate America's crappy rural internet infrastructure)
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That's why I opted to provide the two pieces of code in each example.
As with that, all you have to do is select the piece of Fuselage you've just placed out of the Parts Menu, open up Overload, select Fuselage from the drop-down menu, and add the lines.
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If adding new entries is new to you, that's Ok! It's easy:
1] At the bottom of Overload is a subtle darker-gray box with a + in it. Clicking that adds a new line.
2] Click on it twice (2x), to make two new empty lines
3] In the first new line's "Name" box, paste or type in fillFront, and in the "Value" box type or paste any of the number sequences I provided in an Example above. ie 1,1,0.25,1
4] In the second new line, put in fillBack and the second number sequence from that same Example. ie 1,1,-5,1
5] Click on Checkmark in Overload (bottom-right) to accept the changes, and you'll see the Fuselage immediately change.
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But yea, I just figured it was easier to appreciate the changes first hand, by being able to first play with the Fill sliders through the Parts Setting menu in real time to see the limits of the default 0-to-1 (0% to 100%)... Then be able to contrast it against what I've shown. I didn't think that pics would've actually illustrated what it's doing compared to what was possible via the menu.
Alas, I'm still happy to oblige, so I'll add some basic pics for each example, in case that's all anyone really wanted; give me a bit.

Images?