I believe there should be heavy/light options as well as a "see me" button for each individual item ordered in the case of a request to swap a honey mustard sauce vs mayo swap as brought up by another poster.
Allow customers to decide if they want their sub rolls toasted or not. Not all customers want to have toasted rolls on hot subs. Also place a special request button of the touch screen order machine. That way special directions can be made to a "Made to Order" sub. If you do not want subs "Made to Order" then change the slogan to "Made the Sheetz Way, so Deal With It"
Seems pretty obvious to me. Sell Gyroz.
Where's your regional competition for this Greek sandwich goodness? No where, exactly.
Tzatziki sauce all up in your face!
MMmmmm MMMmm, so good!!