TaftPunk,
Yes I definitely overshot the scope of this one (it seems to be a theme for me).
All of these suggestions are right on! I'd have to mess around with the orbs a little bit to make it work, but it's definitely doable. And I probably should have just included a "Clear All" button from the get go. The idea of being able to align rotas is intriguing-- I thought about having some kind of "snap" system, but ended up scrapping it as it seemed not free-form enough. After your suggestion I could see how it might be useful, though.
Thanks for the follow and the constructive feedback!