Mary with RTS has told me that different seating prices is a function of the software already, so that's covered. Yes, they would be reserved seating like a stadium.
Then, what's the problem? A stadium is reserved by row and seat number. If you have someone in a seat that hasn't been sold, it shouldn't be that hard to tell... especially if you only have a couple of rows.
Past that, I wonder if you might just find this to be a huge headache. Like the balcony problem, you'll always have to babysit it. Would it be worth the trouble?