I had another idea, too. What if there were an effect, we'll call it, say, Kxx, that would simply add xx additional rows to just the one frame? It would be useful if you were writing a song that had just one or two parts where you want an extra measure or couple beats or whatever, but you don't want to add an entire frame just for that, and you aren't doing it enough to justify increasing the number of rows in the song and throwing in Dxx effects all over the place.