I would think if you ask really nicely to your waiter that they would allow substitutions for food allergies, even on the FDP. I've never had a problem with substitutions.
Mama Melrose has always been my favorite meal for me, and has always treated us well. Their veal is HEAVEN, the service was great, the atmosphere was awesome each time we've been there. Kevin was our waiter last time we were there, and he spoiled us with free dessert. I can't wait until our upcoming trip...it's our most anticipated relaxing meal that we look forward too!