These are the keys you can use for your binds.
Alphabet: A-Z
Numbers: 0-9
Function keys: F1-F12
Punctuation: -[]/\' . , ; ~= SPACE, TAB, SHIFT, CTRL, ALT, ENTER,
BACKSPACE, PAUSE
Arrow keys: UPARROW, DOWNARROW, LEFTARROW, RIGHTARROW
INS, HOME, PGUP, DEL, END, PGDN
Numeric keypad: KP_HOME, KP_SLASH, *, KP_MINUS, KP_UPARROW,
KP_DOWNARROW, KP_LEFTARROW, KP_RIGHTARROW,
KP_PGUP, KP_5, KP_PLUS, KP_ENTER, KP_END,KP_PGDN, KP_INS, KP_DEL
Left mouse button: MOUSE1
Right mouse button: MOUSE2
Middle mouse button: MOUSE3
More mouse buttons:MOUSE4/MOUSE5 (some mouses have extra buttons)
Mousewheel up: MWHEELUP
Mousewheel down: MWHEELDOWN