Yeah, this would be useful.
I think in general a nice solution to this problem would be some kind of lightweight Store object. I often find that there are times when I want to add a new lookup table to my system, but I don’t need a full blown table. I need something much more lightweight (basically a nested list).
Similarly, in new pages I find that I don’t really want to make a full table to store the contents of a list, I just want a small nested list.
Adding formulaic control over controls would certainly be nice, but I think tables give us a decent workaround for now.