2.6.12 doesnt add anything to the scheduler, it seems to add only the ability to use a wifi dongle
my above posts about custom crontab are not part of the newest FW, and should work just fine in 2.6.1 and possibly much earlier firmwares
just tested and its works fine so far, but the the parser of the voltage input fields in the scheduler seems a bit intolerant and produces voltage values like crazy 600v if you enter "0.6"
but as long as there is no change log at all, it is the big guessing

There is no need to guess, you can go to our github.
Only difference between 2.6.10 and 2.6.12 is amount of logs from miner_gate_arm. 2.6.10 had too much logs enabled.