We'll have a small gem or something to do that. You'll start your work and we'll track your time and at the end make a commit with the time stamp (or use git notes to keep the commits clean). All the commits you do in that time will be "ignored".
We don't have this now because we didn't have the time to do this (48 hours is not that much you know).
Thanks for the feedback anyway. Well have your comments in mind when developing v2 and the gem.