[JimMorrison]

I play MA R'lyeh a lot, and I can confirm that Enslave Mind (the spell, pretty sure the 'weapon' is copied from the spell) does not allow you to keep PD after a battle.

It can be a bit annoying, but it's not the worst thing in the world. It's still a brilliant spell in many circumstances.

I always just told them to Fire Rear. I suppose in really large battles, you want to get more creative than that, but I'm not as experienced in using EA, so I never had to script Mind Lords for the really big crazy fights. I would say though that in general, Enslave Mind is proportionately more useful early in the battle - you will often Enslave their casters and elite units first, and that can have a huge impact on the way the battle plays out.