With the soon™ release of private lobbies, I believe it would be a good addition to allow us to set a priority queue for which bots we would like to fill in empty slots in our sessions. 

Further, it would be nice to have them utilize the appearance of the host's classes and potentially their load outs and perks to help with higher difficulties. 

Warhammer 40,0000: vermintide 2 has a system like this that works really well and I believe it would benefit the fellow duo teams out there that prefer a bot over another random player. 

I second this. If I could queue up and have my Tactical setup on a bot, it'd be INFINITELY more useful than always getting the Sniper Bot that uses his damn pistol all the time. So frustrating.