that would be pretty much of a whopper of a job,
but like DM it is more for the fun of interplay between players, so bot support might not be present in custom maps, however, the difference of bot support is about bot pathing.
any map can spawn the bots as well as the players but they may run around a little more aimlessly and might not go up lifts, open doors, or pass thru portals unless they happen on the objects.
Bot pathing is what makes the bots smarter and learning where the enemy is.
You might hit the multiplayer viewer and look at the maps being played and jot them down as they may be the more popular maps to use.
Then DL them somewhere.