You can't use the playerbots for anything another than filling out who list.
They can only accept/decline invites, nothing Else.
They are not even close to mimic a real player.
Is it feasible/possible to use bots from other version&core??
Afaik there were pvp bots for WoD 'Battlegrounder'; and there is another project called SPP (AshamaneCore - based on Trinity).