Hear hear... that would be brilliant!
I was quite peeved on a recent flight to get on fairly near the front only to find the 4 exit rows in the middle of the aircraft taken up by 4 youngish, smallish females (not together), two of whom were sitting in the middle of the three seats. The one I chose to sit next to (so I could have the window) was blatantly trying to keep the row to herself, as she huffed and puffed when she moved to let me in.