First, MALA has its own dedicated forum, so you'd have better luck posting there.
1) I am fairly sure Mala has this feature, go into the Layout Editor, and you can add/remove objects with the toolbar at the top. Find a spot that makes sense and drop it there.
2) In Mala options, you can bind keys/button presses to do what you ask. I think by default its setup to switch emulators by hitting Left or Right on the joystick.