Hmm, try looking at the file called "settings." It seems to remember the last theme edited and its attributes. I don't know if this would work, but you could try it out (might want to back up your Theme Maker folder just in case):

Close Theme Maker. Edit the "settings" file and rename the title of the current "last edited" theme to the one you want to repackage. Open Theme Maker again and hit repackage. See what happens! (I haven't tried it. Just a theory.)

And....it seems the OSX Theme Maker is different from the regular one.....so I don't know if the settings file is read, or if it's stored somewhere else? Try looking through the config/settings files for similar information.

Byebye for tonight. Hope that helps even a little.