American Eagle and Raging Bull are absolute must do's for me.
As for eating, I've always opted to eat across the street for way less and better than what Six Flags gouges you for.
I have bought Flash Pass the last six times I was there. For me, worth the money... but they get more expensive every year.
Depending on when you go, Flashpasses might be in order. However, please understand that flashpasses are around $25 a person. However, if you decide to go to Hurricane Harbor, I find the flashpass allows for more flexability
The food at SFGA is a bit weak, but there are a few tasty options. Mooseburger and Aunt Martha's are two of the better options there. The Farmer's market is also pretty good, but some of the food is hit or miss. Where SFGA get kudos from me is the "dessert". The funnel cakes, doughnuts, and cookies are very good! You can find these all in New Orleans place.
As for the rides (if I am understanding correctly) you are going to want to avoid Viper, Demon, Dark Knight, and the American Eagle because your legs are kinda pinned into the car. I would think Batman the ride would give him the most leg room along with X flight. I would try and see if you can get the rest of your family to go on the Dark Knight. Its not really that intense of a roller coaster. SFGA also has some great shows including Pop Fusion and Screams and Dreams in the Pictorium.
As for all theme parks, get there early!
Walt Disney World's Magic Kingdom
Disney's Animal Kingdom
Disney's Hollywood Studios
Disney California Adventure
Universal Studios Florida
Universal's Islands of Adventure
Universal Studios Hollywood