Can you get a barney to use a func_tank? I'd like him to operate an automatic gun in my level, so that I don't have to stand by it the whole time to get rid of the endless stream of grunts (monstermakers and info_nodes, tried it, works brilliantly). It would give my secret agent HQ level better defences other than the guns on the roof which you have to control, and are designed to take out repelling grunts and helicopters.
How about a scientist?
How about a monster_generic?