dead_bwoy, there's something similar to that in the makings: Svencoop for HL2. Remember? Svencoop for Hl1 had some maps that were deathmatch-style with npc's. I'm sure some will be made for SvenCoop for Hl2. In the words of Axel Rose, "just a little patience..."
Later-a-much, and LONG LIVE THE D!,
(Link>>>MarD's Moddin' Site<<<Link) MarD
Yes, I think so. Anyway, when a map is first loaded, a nodegraph is built. I thought that Half-life 2 used a navmesh. It may be possible to tweak the system to use waypoints, though.
i don't know if thats legally possible. We should e-mail valve about this if we may upload parts (or the entire) source for non-hl2-owners (because they verify that on the steam engine).