I've sent a support note to Larian myself - generally they don't reply, but I presume they get thousands, if not more (!), it can't hurt!
It is an awesome game, and just sooo great that we even have split-screen, indeed many of the additional features/tweaks I personally think are fab. But I agree, the lack of a toggle to go between split-screen and not would be really appreciated.
I would hope that they do occasionally have a ganders at their own forums here. who knows?
A shared-screen toggle really would be useful.
Books are also unreadable in split-screen mode. By permitting a full-screen mode this would make it sooooo much easier to read them (they could also just show a single page of the book at a time, but go figure ;-p )
