I was bored and re-wrote the whole extension from scratch. (supports both l4d1/2. plan on adding all the functions and forwards from l4do2 with l4d1 support where it can)
Everything should be there except player_slots: aka l4d_maxplayers functionality. (coming soon)
This extension follows all the functions and forwards currently available in v0.4.6
LINUX ONLY SUPPORT AND UNTESTED Compiled under SM 1.9&MM1.10
Source - Download