I've got a couple of things for you.
1. I think that the Diagram/Chart is not working as it should in the Verified links window. I selected a range of links based on dates by hand (1676 links) and it showed much more links than the Diagram/Chart (100links) displays. I think that it is something wrong with how the tool defines when a day starts. Could you have a look and see if everything works as it should.
2. I'd like to select all the dofollow or nofollow links within a date range. Or at least seeing some statistics about how many dofollow/nofollow links are within a given date range. Would that be possible somehow?