Zaq121 has updated his frontend for MAME GP32. New in version 003:

It adds the ability to not show games that you don’t have. This can be turned off in the config file.

Also added a quick filter, allowing you to enter in a search string and hunt down a game you just thought of.

Thanks to GP32x for the news.
http://www.gp32x.com/board/index.php?act=ST&f=1&t=21723