Err.. TH works on steam, and no it's not mp so that's why it probably won't work with buds. The team over at svencoop (
www.svencoop.com) have been working on converting it, and releasing it with (or shortly after) version 3.5 of Svencoop for HL1. That will be a great update as it'll be the first time the HL1 AI will actually attack while moving.. oo, evil marines just got that much harder, lol...
So I say, wait for They Hunger for sven coop, then RCbot will support it, and you better bet if they don't waypoint it, I sure the hell will.