I browsed through the thread again, and found it mentioned a couple times. Hyslopc was looking for a volunteer to test and help him make the necessary changes, but I don't think anyone ever did.
Now that I have a 2nd unit and am capable of testing, I'm more than willing to help. I sent him a PM and haven't heard anything yet.
I haven't fully tested yet, but I did try adding ZONE 7-12 entries in the INI file, but the program still displays only zones 1-6. HOWEVER, when using the keypads on the additional controller, it SOMETIMES displays the track info, and USUALLY allows me to hit next track, choose playlists, etc.
The keypads on the 1st controller work 100%, and have been for me for quite a while.
So, it doesn't appear much work would need to be done to get this working 100%. Hopefully he will reply to me and hopefully he will have some time and inclination to get this working.