@ColonelStriker First go to the mods menu on the main menu and enable Overload, after that you should have a new button next to the play button that looks like a plane, if you click it while highlighting a part, a menu will open with a bunch of things you can change.

For the purposes of FT stuff, all that matters is the InputController section of things (click the button that says Part, change it to InputController), where you can change the inputId value to anything you want, as long as it's valid FT code.

You can do some pretty crazy stuff with this, but it also works for simpler things like combining inputs (inputhere + inputhere will work for most things, a minus sign will invert the input).

@temporaryplanetester wait this is xml related right? Where do i start for xml stuff?

There is something called Funky Trees which you could use for that.

Example, to make a rotator move with pitch and trim, you'd use Pitch + Trim as the input, to add roll you'd need to use Pitch + Trim - Roll for the right rotator and Pitch + Trim + Roll for the left rotator, since it doesn't automatically invert the input.