Hi! I was puzzled by the fact that encoders 1 and 9 buttons were not put to good use in Ableton Live (Shift+Pad8) mode and made some modifications that allow those to arm (push encoder 1) and mute (push encoder 9) the selected track. The code is here:
https://github.com/dotbr/AbletonMinilabExtrasHope it works with you too. It's my first attempt to mess around with Control Surface scripts. It's poorly documented, so I don't know if the way I did is the best way, probably not, but it worked.
Cheers,
Leandro