Wish there was, but when they fight they go off the waypoints. The way i handled it in the rafters of MML_Church was to limit the actions in the rafters to just snipers and panzers
, that way other classes would not be drawn to the risky area. Still the other classes did go to the third floor walkways sometimes and jump from there! But by the nature of that map and the waypointing less than 1 bot suicides per minute.
If you can't keep the bots to a different location you could set up a brush to block the way down but that would not be very realistic. But if you are willing to get into it further, Crapshoot has worked on a new wiki topic on how to add an (invisible) brush to block things like exploits.
Check it out.