I was thinking about this as a server-side option. As an example, the survival defence mode you just worked on could work very well with momentary AI reinforcements for the attackers that don't respawn after they die. Adding 5-20 bots to a game would really fill up the HUD with unnecessary info, and it would definitely not be useful either if someone wanted to design let's say a co-op mode.
It's something I've been trying to work on, mainly so they'll attack to a certain spot as a team through kismet. Unfortunately while I can easily obscure them from the scoreboard and make them not respawning, I haven't managed to grant them a nice AI that can make them a decent invasion force.
As for pedestal, it's rather easy to do by theory, but mappers need to adjust to this as well eventually