Pr0ducer,
I would NOT ask a BATFE officer about MA law, it's not their jurisdiction and they really don't care (from a legal standpoint).
Just like I would NOT ask a MSP Trooper or local LEO about Fed or MA gun law, they are NOT involved in the Fed law and most of them really don't even know MA law.
As for FA-10 or not, my source of authority on that is Chief Ron Glidden directly. I asked him about it when I got my C&R FFL. When I'm in doubt, I send him an Email, call him at his office, or call him on his cell phone to get the answer.
I'm not sure what specifically you refer to about the SKS issue and monitoring these forums is taking up too much of my time currently for me to go back and check. I do know that sometimes I may post something that may not be as clear as what I had intended and may thus be incorrect as written. I know that I am not perfect and sometimes will err, when I find out I acknowledge it and try to correct it. In some matters that I don't know I'll either query Ron or if I have no interest in a particular area (e.g. AOW, SBRs, F/A, most NR issues, etc.) I'll just let it pass and let someone else answer it.
As for handing over someone's info, you heard from the boss!
However just understand that NO-ONE on these (or any other forum) are really anonymous and if LE gets a bug up their ass to go after someone, a post that implies illegal behavior (self-admission by person posting it) is all that they need to get a judge to sign off on a warrant . . . and Derek or one of us would be legally obligated to cooperate.