This is for those who have rented servers & are allowed to have only 1 bot. If you set "bot_minplayers 1" the bot leaves whenever someone connects. If you have the bot in their constantly, then it's a waste of space (in duels anyway).
With this bot_max CVar, you can cap off how many bots are in the room at 1 time.
Lee: Mike already coded this for the 1.3 release of JA, if you are interested in this he'll give you the the code he uses.