What it does not directly support is coms between cgminer and the Bitmain PSU's to monitor & set voltage. That said, cgminer DOES support setting chip voltage(s), you just need to figure out how to point it at the PSU's that Bitmain uses.
This seems like a pretty good place to start.
It looks like coms between control board and PSU (APW12) are through i2c (
https://www.zeusbtc.com/manuals/Antminer-APW12-Power-Supply-Repair-Guide.asp). My first thought is to rig two raspis in between the control board and PSU that capture/pass along messages, then try to reverse engineer with those logs.
Does that seem feasible?
Also, where does this lay in terms of what is "allowed"? I feel like if I do this with the stock firmware, which is in breach of the GPL3, there's no harm done. But what if I use epic firmware, which may or may not be in breach of GPL3?