Having bots added to private servers is actually not something completely new.
The DaoC Eden freeshard is the first of the many versions of the older MMO DaoC where they managed to get AIs in, to help with action in case of low population on a global timezone server.
Video of some players fighting against these AI:
https://www.youtube.com/watch?v=_aTdGTB20iI
Now the bots do some basic level of assisting, debuffing, controling and attempting to kite.
I dont think the collision, or the punting/pulling mechanic would make such bots easy to behave on RoR. And honestly, I dont think them being fuctional with pathing would work over so many maps as RoR orvr offers.
The time investment simply would never be worth it I would think. But its a fun idea to think about atleast.