The entry has to go into a config in the themes folder if you use dmenu 0.3 iirc (i use dmenu 0.2 because of that ^^).
The mod is definately very impressing, but you can´t play through the whole game i think. I can´t use buttons, professor´s can´t too i believe. So i use NoClipping very often, but now i´m stuck in a test chamber (bad inglish ) and the professors can´t start the test.
Someone knows a way to load a specific map? Or some savegames, guess i can´t use HalfLife savegames. ^^