Yep, found this in the 'beta11 release notes':

"Running order tweaking support has been added. You can dynamically tweak the order of the currently playing running order. This works by scanning forward from the next track trying to find a track with a matching field and swapping it with the next track. e.g. pressing 2 on the remote control during playback will find the next song by the same artist as the current song and ensure that it is played next (if it exists). If the next track already fits the criteria then subsequent tracks will be swapped, so pressing 2 three times will cause the next three tracks to be by the same artist as the current track (if such songs exist in the remainder of the playlist). 2=Artist, 3=Source, 5=Genre, 6=Year. You can also swap the next track with another later in the running order at random by pressing 8. "

I got my player with beta13 on it, so I never heard anything about this 'officially'...

Maybe there's more I don't know, because it's not in my manual !?
Really would be cool to have the latest manual-version...!

Dr. Pupvogel
mk2 #080000169