I've toyed around with it a bit and you can use a Charm spell instead of the Mez. I use comments to make it easier to change to what I want to use.
You'll need to replace them with your level-specific Mez and Charm and Tash spells and make note of the levels of mobs they affect.
I adjust MezMaxLevel as needed as it differs between the Mez and Charm spells. That way I'm not trying to Charm a creature that's too high of a level.
I hope this helps. It's the best I've been able to come up with, short of an official solution.
[Mez]
| Note: Mez - Addle (Max Lvl 123), AoE Mez - Mesmeric Stare (Max Level 123), Charm - Marvel's Command (Max Lvl 119)
MezOn=1
MezRadius=100
MezMinLevel=75
MezMaxLevel=123
MezStopHPs=10
MezSpell=Addle
| MezSpell=Marvel's Command
MezAESpell=Mesmeric Stare|3
MezDebuffOnResist=1
MezDebuffSpell=Edict of Tashan
Also, you need to make sure that you don't already have an animation pet summoned. But you probably already know that.
