LOVE! Keep the kiddos stimulated & engaged while they're in the side lines with snacks, toys, and other comfort measures. Spoil them rotten for your 2 hour photo session! You won't regret it when you see the variety.
I doubt I can get him to do another "kissy photo" because he was a little embarrassed last year, but maybe a sweet forehead to forehead gaze or something instead... if we can get a shot with the kids inside the pumpkin house like that.