I have find some commands that works:
;r_shadows 0
;mat_picmip 10
(I think there is more commands that works)
Well I believe it's any command that can fit into the 14[15] character limit will work.
Some commands doesn't work because it is for the 360, but that is just some odd commands. Oh, by the way, i know how to play on a half life 2 map WITH the patch:
;map d1_town_01 (Works, but you will spawn in the skybox)
;map d1_town_02 (Works, in this map you can actually move around and shoot, but you spawn in a little black room, not so fun xd)