Would you please add the ability to check for roms in the rompath regardless of whether it is a .zip, .rar, or .7z

Here's why:
If I compress all the roms into a solid 7z archive, then a new version of the dat file comes along, now I want to rebuild only the missing roms as uncompressed. That way, in theory, I could manually rebuild only the sets that have changed. Right now, I get ANY file that matches copied/rebuilt into the directories. Does my explanation make sense?