There’s a slightly more complex guide to configurating here: New 2.x Configurable Keyboard/Gamepad Firmware
You can always use g as a “help, I’ve mucked up my configuration and want one that just works” safety net. So go crazy!
You can do nonsense stuff like bind a shift key to make the joystick control volume. etc.
I’m also planning to add a couple of levels of analog if I can, so you can hold a shift key to go to 50% on the Joystick instead of full-whack. This could be useful in N64 games where you might want to walk, instead of running full-pelt off every cliff. I tried Mario 64 and it took some finesse!