Firstly, I don't think too many of the old timers here would look too unkindly on me for letting you in on the huge secret that the turn-based toggle is..........Enter!
Secondly, I would wait before plunging into MMX. There are still significant game-killing bugs not addressed in the first patch, not to mention that your GPU will probably end up toasted.
Shame because the overall gameplay was pretty nice, the quest storyline contained some nice throwbacks to the earlier games, and the final fight sequence was solid (apart from the fact that by that stage you can accidentally kill the baddie before finishing the game as intended...... But it's still a beta IMO