Open the cans of pie fillings and put a spoon in each one.
Main problem is putting too much stuff in the burrito - try to talk people into taking smaller amounts.
Put all the tortillas in a foil wrap and carefully heat them before so they are more flexible.
Putting tortillas directly into the coals will burn them - keep them away and rotate often.
Each person should mark his burrito wrapper somehow so he knows it is his - special foil fold or permanent marker or series of poked holes in the foil.