Now this seems to be a very good emulator, I tested it and it worked well with the three games I was interested with - all of Dissidia [012], Monster Hunter Freedom Unite and Code Lyoko load.
One issue I'm having is the hotkey. Documentation says it's L3 which I think means "push the left joystick hat". But that doesn't seem to do anything.
The hat does work correctly for other functions, such as if I assign it to the (PSP) screenshot function or to save/load state. But not as a hotkey.
(Possibly unrelated, assigning a button to the "toggle fullscreen" command makes the system crash back to home menu if the button is pressed. I normally wouldn't care, I only tested it because I thought if I could not access the PPSSPP menus from the hotkey, maybe I could have done it from touch in a windowed mode)
**EDIT**: I don't take it there's an option to change the button associated to hotkey, or perhaps remap it to touchscreen?