update
Got a first reply from Valve. Unfortunately they misunderstood my question, so I wrote back to clarify.
Did Valve happen to understand and provide an answr at all?
I would assume it is ok to use it, as it is fine for the likes of TF2 also :S
The consensus from user reports is that the mod should be OK to use, as is the TF2 fix.
Unfortunately the ticket I submitted to Valve keeps getting closed without an answer, so I am continually reopening it. If this continues I will look to redirect my approach, maybe even with a polite EECB. After all, multi-mon gaming is poised and ready for significant growth, so companies need to take our concerns seriously.
Also sorry I haven't been on this project for awhile. Real life sorta came unhinged in long-term fashion. I'll keep tabs on the thread and do what I can. Great to see some other guys stepping in to help out, BTW.