I think you should be able to select any sauce you want for any item. I love the Dr. Pepper BBQ sauce, but right now if you order a fried appetizer sampler that isn't one of the choices. I think you should make all the Sheetz sauces available with any item you select and/or include an extra tab at the bottom of the food selection screen where you can add extra sauces.
Sheetz should develop it's own sauce to include on burgers, hotdogs, chicken, sandwiches, etc. It would add value to your products and be another awesome food item!
I love Sheetz sauces. All of the different kinds are delicious! I always get sauce with whatever I order at MTO, and I would like to be able to have them at home too. They don't sell any of their sauces in bulk, but that would be a nice addition to Sheetz and a great change for everyone who loves their sauce.