Made some changes in the config-files (autoexec.cfg and config.cfg) to make it a little more playable. Speedchanges etc...
Keys: w,a,s,d (forw., backw, sidestep...)
k, l (turn right + left)
space (shoot)
i (jump)
x (down in water)
Check out the config.cfg file for key settings.
Shift+0 (zero) = save menu
Shift+1 = load menu
Shift+9 = quit
Shift+2 = cheat to give player all weapons + ammo + 999 health
change aim_sv to a higher value (not higher than 1) if you don't want as much autoaim as I have set it to.
Rightarrow = change weapon

Do not unpack files. Just remove .zip-extension. Put in /media/mmc1/quake/id1/

Change keyboard layout to english to be able to choose from load/save menus.

Enjoy!