Another question. Is it possible to allow for re-mapping the joystick buttons. For example, it would be nice to use one of the hats to perform rolls (I have a USB Combatstick) instead of the keyboard.
It is certainly possible to remap the joystick. Check vegastrike.config (some random stuff at the top, then keybindings. Joystick bindings are under that)
Unfortunately I haven't been able to make the HAT on my joystick work since shortly after the guy who wrote the joystick code disappeared (years ago). Someday we'll get that going again
That's probably something that would be within your skill set to accomplish Mamiya0taru... I certainly can't fix it as my USB joystick of that era died and won't even get recognized on my systems :-(