Bryan,
Not entirely dead, no -- I failed to ever release it in the MODx Extras section (even for Evo)... so it's a hidden gem of sorts. I even have un-released updates to the current Evo-version
Considering MODx Revo 2.2 now supports Media Sources, it could seriously change the direction with how a Revo conversion of Multimedia Manager would be handled, since that's very similar to how the MMM back-end is configured.
I plan to take a stab at converting some of my more simple extras for Revo to get a feel for the new approaches required:
http://rtfm.modx.com/display/revolution20/Developing+an+Extra+in+MODX+Revolution
Once that's done, I'll almost certainly look into your request -- I'd love it, too!