The following key combinations invoke UAE commands or functions:

F12 + Q Quit UAE
F12 + R Reset UAE (warm reset)
F12 + Left Shift + R Reset UAE (cold reset)
F12 + D Open built-in debugger/monitor

F12 + S Toggle between windowed display and full-screen mode
(if supported by the graphics driver).
F12 + G Toggle mouse-grab mode (in windowed mode)
F12 + I (or Toggle display inhibit (Amiga screenmodes, not P96)
Scroll Lock)
F12 + A Cycle through audio interpolation modes
(interpolation works with 16-bit audio only)

F12 + Numpad Plus Increase frame-skip rate
F12 + Numpad Minus Decrease frame-skip rate

F12 + F1 Open dialog to insert floppy image in drive 0
F12 + F2 Open dialog to insert floppy image in drive 1
F12 + F3 Open dialog to insert floppy image in drive 2
F12 + F4 Open dialog to insert floppy image in drive 3
F12 + Left Shift + F1 Eject floppy image in drive 0
F12 + Left Shift + F2 Eject floppy image in drive 1
F12 + Left Shift + F3 Eject floppy image in drive 2
F12 + Left Shift + F4 Eject floppy image in drive 3

F12 + F5 Open dialog to load emulator state file.
F12 + Left Shift + F5 Open dialog to save emulator state file.

F12 + Nampad 0 Quick save emulator state.
F12 + Right Shift + Numpad 0 Quick load emulator state.
F12 + Numpad 1 Quick save emulator state to slot 1.
F12 + Right Shift + Numpad 1 Quick load emulator state from slot 1.
F12 + Numpad 'n' Quick save emulator state to slot 'n'.
F12 + Right Shift + Numpad 'n' Quick load emulator state from slot 'n'.

F12 + F Emulates freeze button of Action Replay cartridge
(if you have a cartridge ROM loaded).