Changes to the Usergroup promotions
 

Ok, in the admincp under the usergroup menu, there is an option for promotions. Excellent feature! I use it to automatically move users from the COPPA/Moderated usergroup to the registered usergroup after the user has posted 5 times. But I want to do something else with it. It gives the option to move users to different usergroups based on reputation, number of posts, and their join date. I'm fine with the rep and post count, but I have been trying to modify usergroup.php to prune the users based on days since their last post and not their join date, but so far I have not been successful. If anyone could help with make this modification, either by way of product/hook or direct modification, I would be extremely appreciative.

oh, and I restored the code back to its original state, so I don't have any of the modifications I have been working on so far, but regardless, they didn't work. it kept coming back with database errors.