For the most part, the moderation is fine. There really is only so much one can do with people these days, especially if they want to be overly sensitive about something.
However, the question then becomes, what are the limits that you are specifically giving the scanlators in regards to "insulting"? Are they being held to the same standards as the readers in that regard, despite it not being in the comment/forums?
In regards to the "sniping", Maybe the scanlators can actually try to work out something right here in the forums, kind of a public discussion and try to decide what would be a reasonable amount of time before another group jumps in, or to iron out other issues. Just a matter of them being respectful towards one another despite having different opinions.
This site can be more than simply an aggregate site. Just a matter of getting past some issues.