Searching for users with a certain number of posts in a period of time?

[lrshelby]

I have a question regarding user searches. I would like to search for users with a certain number of posts within a given period of time.

In my experience, through the Admin CP I can create a list of members using:
Last Post is After
Last Post is Before
and
Posts are greater than (but this is total posts, not number of posts within the designated period of time)

But this doesn't exactly do what I am looking for. I would like to generate a list of users with a certain number of posts within a given period, such as a minimum of 5 posts between January 1, 2007 and February 28, 2007. Is there a way to do this? Am I misunderstanding how to use the search features in the Admin CP and I actually can do this? Or do I need a separate search query of some sort?

Any help would be appreciated.
RS