I've been to the commissary, but the veg choices there are decidedly limited. Not that I mind, but my kids, you know. The only CS we ever get in MGM - uh - DHS (Which looks too much like an abbreviation for DISHES

) The only CS we ever get there is Pizza Planet. Which isn't bad if you like theme park pizza. Which we kind of do. But it's Pizzafari all over again and noisy and not really where I'd want to go if I didn't have kids wanting pizza, I guess. However, if you do go there and get a table outside, it's not nearly so much like eating in an electronic-riot-machine.
Definitely, DEFINITELY see the Beauty and the Beast show. I totally agree with you on the beast in the, you know, movie. But in the play, he's not nearly so "pretty" - looks more like a handsome guy, at least the times I've seen it. The actors in that show really put on a good performance - the costumes are really interesting, and the production quality is, as usual, surprisingly good for a theme park.
Plan to arrive early for good seats, and also, depending on the day of the week, to see Four for a Dollar, the a cappella group that opens for B&tB. They are really entertaining and very good. They appear Tuesday - Friday and do their show about 20 minutes before Beauty and the Beast show time.
Seriously - if you will be there on one of those days, plan them into your schedule. Unless you hate a cappella music.

Some people do, but not me!
Favorite shops - I haven't been able to do a lot of shopping, well, anywhere ever, really - except my stolen 20 minutes in Japan. But we have been through the Villain/candy store more than once and it is a favorite. Have you been in that one? It's pretty fun. I got my sister some Jack Skellington pajamas for her birthday there, which she loves. It's stuff you don't really see in lots of other places in WDW.
Catch some Streetmosphere for me, would you? We always seem to go right past those movie stars and whatnot, and just for once it would be nice to actually have some interaction with those people.
Have you toured the Muppets shop? Me either. But I saw some photos on BroganMc's live trip report and there is soooo much cleverness and theming in that store, it's unreal. When I've been in there, I was distracted by the merchandise and looking for a replacemet purse for my mom, etc. etc. etc. It would be great to go back and just look for the "Chickens only beyond this point" sign, and stuff like that.
It sounds like you've got DHS all under control, though. Enjoy the animation studio (as much as you want!) and the thrill rides and the NEW ride. And beyond that.....enjoy NOT going to Lights, Motors, Action in the August heat.
I have a friend who went in August (hearsay!) and she said it wasn't that bad. They all got those misty-fans and just walked around with those. But she's from Memphis and I'm from Minnesota, so I maintain that she and I have markedly different ideas of what "not that bad" in August means.