Sheetz (#347) should have a drink add in/on option for Cinnamon for all MTO drinks. In addition perhaps a shot of expresso should be an option for Milkshakes, there are some great milkshakes that with a shot of expresso taste delicious, at least having the option would be great (as opposed to adding it via another drink and explaining you want it in the milkshake).
I know there's already multiple dipping sauce to go with the cinnapoppers, but non are the traditional white icing or maple icing you get on cinnamon rolls.
For your time.
MTO needs a big home made Cinnamon Roll - lots of icing and butter - hot from the oven.