Attila has released a new build of the port of the Amiga emulator UAE with support although early for the Keyboard, heres what he says:
How the keyboard input works :
- Press AND(!) HOLD the [] - Square button.
- Press the Up / Down button ( on the left side of the PSP ) to change the selected key.
- Press the Left / Right to jump to the beginning / end of the keylist.
- Press the () - Circle button to actually "Press" the selected key. ( still holding the [] - square button ! )
At the moment no simultaneous key input is implemented ( like pressing a key while holding this and that ).
I know this is not what you had in mind, but it kinda works for now... ;-)