I take it Alan want's something that stays current with the individual emulator releases as in it queries each emu in search of a new release.
The repository manager works great IMO and is easy to use. Where it's lacking in this instance is that it isn't updated nearly often enough to remain relevant for actively developed emu's (Dolphin, etc.) but works fine for those that haven't been engaged in active development in ages.
If you had something like the auto downloader for emumovies that went and hunted for the latest and greatest version of each emulator supported, that's what I believe Alan would like,