Custom mission for Authenticated Users who haven't visited the site for a set period -> Set Period by Date

First, I am so thankful to have the module in the first place I feel a bit ridiculous asking for anything! So, if you will excuse my greed...

My thought on this is that if you added the functionality to use a given date, it would be cool to customize the message for people who haven't logged in since before that date. For example say you add classified ads on 4/1/07 you might want anyone who logs in for the first time after that date to get a note in the mission statement letting them know it has been added. The number of days isn't as relevant as the change you want to communicate for users who return.

A ridiculously cool version would be multiple statements by date so there could be as many items as were relevant to when someone was last a visitor. That could get tricky with a bunch of new feature requests on top of it but would be cool as a "what has happened since you were last here" type of thing.