Agreed. Backstab, while vastly improved over DOS1, is still way to clunky to deal with for an entire campaign.
I do not see why the backstab area can't just be in the back. As in a 170 degree cone, instead of a tiny specific dot you have to pixel hunt for half the time.
Guessing they want to prevent more than 1 character backstabbing at the same time, but really don't think it is worth the trade off.