Yes, you can do that. Last year we (2 adults, 2 kids) used 2 TS credits (1 adult, 1 kid) at Rose and Crown and at Coral Reef. With the credits we saved we went to CRT, which requires 2 credits per person.
This year we used only 2 credits at Le Cellier (but bought wine, extra appetizers and a side dish) and at San Angel Inn. With the extra credits we went to the Hoop-de-do Musical Revue.
When the appetizer is removed from the plan Jan. 1 sharing meals will become less common. We probably won't do it anymore. But under the current plan it made a lot of sense for us.