I would like to see single-player receive the ability to create a small party with the thralls. Not sure the best party size (4-6).
The thralls would need some advanced commands to be able to control them in combat. And some combat stances. Fitting some traditional party roles; tank, dps, ranged dps, etc.
I know some replies will be to just play with other real life people. Not everyone wants to play with other people. Not everyone has the time for an online persistent server.