Just a thought to make @"Mhx Ar"s journey of Shifter possible, and maybe even make Starblast 3 (and eventually 2) have controller support.
Triggers:
Joystick- similar to the keyboard trigger, with imputing after clicking the button would set it to that specific joystick. It would have 2 inputs that fire simultaneously: direction and intensity. The direction input fires values from 0 to 259, depending on which way the joystick is tilted. The intensity fires from 1 to 100, 1 being barely pushed, and 100 being all the way.
Buttons- exactly the same as the keyboard trigger, but specifically for controller buttons. (Also for joysticks that can be pressed in)
Components:
Rumble- if the controller plugged in is capable of this, it will rumble/vibrate when imputed. Inputs from 1-100 will be the severity. Anything above 100 will register as 100.
In conclusion, all of these behaviors would make controllers 100% usable, as far as I know.