How to use this:
1) Download config file. Save it into your config folder as "lights.cfg".
2) Open "autoexec.cfg". Copy/paste the below into it and then save it.
exec "config\lights.cfg"
bind L [ if $editing [ showmenu lighting ] ]
3) Open ac, go into edit mode. Press L and it will bring up the new menu.
FYI: This menu will be obsolete when AssaultCube version 1.0 comes around, as there will be a new 'slider' menu available in that release.