If you are seated in the restaurant, it's a TS credit, no exceptions.
The carry out window will accept snack credits for cones or scoops and for beverages. I'm not certain if they will accept them for small sundaes or if all sundaes are exempt.
I don't do the dining plan so I usually glance at the menu instead of studying it, so I can't tell you for sure but I think you can use snacks for up to 2 scoops.
My friend got a No Way Jose from the carryout the other day - but I do know you couldn't get that with a snack credit. I think they may have made a couple of the specialty sundaes available from the carryout since you now will probably need a reservation to get seated inside.
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