Bot behavior like IH jumping, translocating, lift operation, everything like that is in the map itself. I've made a few maps *crap* but I got really good at manipulating the nav points to make the bots use the maps the way I would. Most people plot nav points right down the middle of hallways and such, behavior that I myself would never do.
What I would like to see is a mutator that nullifies any map's existing nav points, defense points, tranny points, jump points and the like, and LEARN the map by following what the player does. If you've ever used the Eraser Bot for Quake 2, those bots were capable of dynamically learning from your routes on a new map and didn't forget the next time the map was played. They acted like idiots for about ten or fifteen minutes, but were very sweet afterwards and from then on out.
I play Deck16 religiously, and get really annoyed about bots congregating around the steps of the long catwalk, I've modified the nav points in the map myself to get the bots to do some amazing things, like tranny up to the sniper rifle, tranny away from the flak cannon in the goop pool instead of using the catwalk, camp and snipe in the very dark areas... etc.
I lost that modified map in a re-install of UT, but the bots on that map were freakin amazing. They would tranny up to the top of the large crates and camp for you there. Sweet.
Maybe someone could code a mutator for us to mimic the EraserBot's learning abilities, but requests for these type of things are rarely taken on by coders. That would be sweet, tho.