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Hi and welcome.

MMC is featured in Qtractor for quite some time now (see MIDI Machine Control (MMC) Fun)

However, its implementation has not been tested with anything else but my Tascam US224 control surface, via us428control (in alsa-tools) and guess what? most of the pertinent code was written by yours trully :) So it might just happen that is kind of a specific or narrow-minded implementation and just don't work with anything else. :))

It would help whether you can dump what MMC events are being actually sent by your M-Audio Prokeys 88 keyboard. Try using aseqdump to trace what's going on and paste it here, specially the ones related to the start, stop or rewind buttons. You can also try rebuilding qtractor for debug (./configure --enable-debug) and watch what is being captured on the console as MIDI In...

BTW. does it work with Ardour?

Hope to help you (and me as well:)
Cheers