I am surprised that there is not more replies for this feature. Here's what I am thinking.
1. Search should be by any core field created. This meaning also can do a search by roles.
2. The display should be sortable by web admins. I.E. let's say instead of the filter for online users to show up first I would like to make it where role based users show up first. A hierarchy we can control. Also would like to have by rating. (if that feature ever comes up) So if the user is rated higher then they will show up at the top more often.
3. The user list currently allows for a new members list. This mod should be customizable as well. We should be able to either show newest members or one thing I would like to do is make it an option to show random profiles. There could be options for other ways to show different type profiles.