Yesssss! A.I. bots would be absolutely amazing!
Some options I would like to see:
• Bot types
   ○ Guard: Will not leave an area, will only attack if threatened. (Attacked first, or player comes too close)
   ○ Patrol: Same as guard, except it will follow a set path. Will only leave path to chase target; will return when target lost.
   ○ Hostile: Roams around looking for something to kill. 
   ○ Passive: Roams around doing nothing, but will defend itself if threatened.
   ○ Harmless: Roams around doing nothing, will try to run away if attacked. 
• Bot "Difficulty" settings.
   ○ Difficulty Presets; Cowardly, Easy, Normal, Hard, Relentless.
   ○ Custom Setting (adjustable sliders of accuracy, attack rate, view distance, view angle, chase time, and fleeing point)
• Easily adjust the bot's playertype, uniforms, and also speed, health, and size modifiers.
• Set which items a bot will use at close, medium, and far range from target.
• Bot Auto-fill Team (If a team is set to 8 max members, and the team has 5 players, the remaining 3 are filled with bots) 
   ○ Can't be used if max is set to -1, and should have a limited number of bots in case of high team max.
Things I would use bots for:
• Prison guards
• Wild life hunting
• Zombies
• Player Vs Bot DM
• Castle defense against increasingly difficult bot attackers.
• Random Epic Dragon Fights