It's nice to be able to view old versions of a score, but in would be even better if I could link to a specific version of a score. For example, if I'm working on a score that is publicly editable, I may want to ask for feedback from friends & would feel more safe emailing them (or tweeting or sharing) a link knowing that they'll see the score as I intend them to, and not a version that has long since been modified by another user.