Supercategories do not show up when used at the top of a table in 12.2. The SC's show up on the side of a table, but not when used at the top of a table. Am I missing anything?
I don't think you're missing anything here.
Supercategories are assumed to be applied to responses and responses, generally speaking, are in the rows of the table not the columns. There are some statistical details that would have be resolved if we allow them in the columns.
If this is something you want, please send the request to Tech Support to get it recorded properly.
This is definitely something we need in my company. Would Tech Support be the right place - since it opens a generic support email- or is there another way to prioritize?
Although Tech Support is a generic email, you can have confidence that it will be directed correctly internally, and receive appropriate consideration. Linking to this thread might not be a bad idea too, though you should still spell out the new feature request.