Allowing laptops in class is a huge mistake. Nobody does anything when they bring a laptop. And I have to admit that, even though I'm not the most academically performing guy, when I do go to class I find it annoying when people start surfing or writing emails, simply because it's hard not to pay any notice to them.
Also, concerning assigned seating, most of my teachers to that. It's simply an easy way for checking who's there and who's not.
Wharton admits, join the rugby team!! It'll be by far the best experience of your MBA life