How do you set tactics/behaviors for your party, Manki?
With the default party, Usually have both mages on "Defend:Cassandra" and Cassandra on "Follow:Controlled Character". This let both mages focus there defensive CD's on Cass. Cassandra will focus on my target with those. All my Characters are at 10% Mana/Stam focus, this is so they have the available mana to cast the higher cost spells when needed.
Solas will have preference on dispel, Barrier and revive. I actually leave all the other abilities available, so that he can use them when hes got nothing to do.
Dorian will have all of the CC's (Fear spell, Chain Lightning etc.) on preference, with the defensive spells on normal. This usually works out where he will end up CCing a target that is not mine, since he is set to defend Cassandra and it seems to randomly target one of the enemies targeting her. Also with his barriers not on preferred they are more likely to be cast while Solas' spell is on CD.
Cass will have all of the Guard generating and taunts on preferred. Also don't have anything disabled with her either.
Using this setup, the only time I have to micro manage is when the mages get targeted by enemies, or when they are too close to the enemies. I've noticed the mages wont run towards enemies on there own, but they wont move out of melee either. Honestly, if they patched it where I could make my mages have the "Ranged" characteristic, as in past games, where they will try to keep their distance from enemies, I'd never have to control them again. Hopefully this can help those interested!
p.s. If I am running with one of the other characters besides the 2 mages, its generally the same as this. A DPS character will be set to "Follow:Controlled Character" with all the dps talents preferred. Vivienne is basically a melee dps anyway, so the same rule applies.