After playing Divinity: Original Sin I've come to the sad realization that I really hate turn based combat. I like everything else about the game, I just hate the combat.
So I'm incredibly relieved to see that PoE is going to use real time combat. However, I do support the OP's suggestion to have the option of using turn based or real time combat. Options are wonderful! The more the better I say!
Unfortunately, as others have said, I think it's a bit late in the game's development to implement it. Still, depending on how mod friendly the game is, somebody might be able to add it with a mod.