I think until recently it wasn't anything anyone would have considered. There has been some conflicting experiences with regard to using TS credits for CS meals; I suspect we'll see some similar conflicting experiences with regard to using CS credits for snacks. I'll plan on using the Dining Plan as it is outlined in the brochure, and then ask around when we're hungry as to whether any of the substitutions and exceptions I'd like to have are available to me, paying OOP, as necessary, if the answer is no.