First of all, this is probably the best notation program I've seen in a while. It neatly avoids the mind numbing complexity of some music programs, and while it needs some work, it's very exciting. I've used it for a lot of things, including quickly notating music I've heard in dreams before it fades away in the morning! When I'm in a bit better financial shape I'm defnintely going to contribute.
Question: how do you insert a note or rest between other notes?