there, Just hoping to filter my membership listings

Hi there,
Just hoping to filter my membership listings by the different headers (username, name, email, etc.) – much like you can do in the built-in WordPress administrator.
Where would I add this in the plugin code? Is it something you could look at integrating in the future?
Also if I could export this data as CSV/XLS that would be great.
Let me know if you have any thoughts!
Cheers,
David