Yes, it's possible! In fact, it's possible to ride it three times in one day! We did it the Saturday after Thanksgiving, so it was a fairly busy day. The key is to get there at rope drop, or just after as was our case, on a non-EMH 8am opening. I think we arrived around 8:15am and immediately pulled RSR FP #1 for a return time of 9:45. After pulling FP we then went and rode it stand-by because the CM said it was only a 30min wait, but it really turned out to be 40min. No big deal, the line moved pretty quickly and it was fun to see the entire queue. We were done with our first ride around 9am so went and rode Mater's and some rides in Bugs Land. At 9:45 I went over and pulled RSR FP #2, which gave us a return time of 5:45-6:45pm, which was perfect since we wanted to ride it at night (it was dark by then in Nov). After pulling that FP, we went and used FP#1.
After riding RSR with FP#1, then go and pull A&E FP. I'm guessing that you would pull that at around 10:15 and your return time would probably be around lunch time, if not earlier. The A&E FP does not count against your RSR FP, so you could pull it earlier if you want, but it's totally possible to get them both done before lunch. Just be careful because A&E has a smaller return window, like 20min so you don't want to miss that.
I hope that all makes sense. Have fun!!