when i started recently plaing again i wish i could set my desertmerc (holy freeze) to some sort of passive close range staying... So that he doesnt run in trouble to far, my frozen orbs cant reach.

Some actual make up would also be if you could make it that the pots you use yourself are shared with your merc. So in a situation when the merc is close to dying but you really dont want it to happen you could just drink a rejuv...