YAYMan (Yet Another Yamj Manager) is a GUI which allows you to edit the information for individual videos without having to delve into the XML manually.
YAYMan requires YAMJ r3835 or newer.
See the included readme for running YAYMan on Ubuntu.
You can find additional downloads, including native application launchers for Windows and Mac, here.
December 9, 2013: v0.99.99.26 released. Fixed compatibility with latest YAMJ. Apologies for leaving everyone high and dry for so long.
Please post all questions to the support thread below: