Which game are you referring to specifically? I assume by "Developers' Cut" you mean Ego Draconis (or Divinity II or Dragon Knight Saga etc) which is the odd one out in that it's a third-person game where the camera does always follow the character and is pretty much fixed: the vertical angle can be changed and you can rotate the camera around when standing still but that's your lot, there's no "tactical mode" or anything like that, I'm afraid. I'm another sufferer of motion sickness and often get it really badly, but D2 was one of the least bad games I played for that.
It is a one-off, though: of the more recent offerings, both Original Sin games are isometric points of view and the camera can either follow your character or not, easily switchable by homing in and then just moving it about. They're much like the original Divine Divinity just with hugely updated graphics and a rotatable viewpoint if you want it. I understand that future games will probably use the same engine.