Allow Rssearch to search a specific database table and through titles

I would be a great IDEA to allow RSsearch to search through a specific(selected) database table and have a choice to customize the search base on the value offered.

ex: 1)search the table #__users
2)Let admin customize the search in backend
-allow username to be selected
-allow first or last name to be selected
3)In frontend user can preform search on #__users and only be able to select username, firstname or lastname as a option