Just for comparison: When I take a look at the German channel, people also don’t talk about Go there, but it seems to be just smalltalk and jokes. In the French, the Russian and the Polish channel, however, what you can currently see is about Go (as far as I can tell with my limited language skills), but there’s decidedly less activity than in the German or English channel.
If you would come to the German channel with a Go question, you would not drown in offtopic chatter, though, and there would be enough space for a Go discussion. In the English channel, this might be different at the moment.
In general, my personal opinion is that it would not be okay to deny people to talk about whatever they want in the chat (as long as it isn’t hurting/discriminating anybody, of course). And, as @loredude_Ω said somewhere above, it’s a good thing by itself that there is a lot of activity - when you come to the chat and no one is active there, it’s also somewhat discouraging in my opinion.
So I also find it a tricky problem.
But my answer to question 1. would be: change the name of “English” to “English - All Topics” (or something like that) and create an extra “English - Go Talk” (or so). Then the people who are there now can just stay where they are, and if someone wants to have a serious Go conversation, they can move over to “Go Talk” – or, if it should turn out to be too lonely there
, simply ask their question in “All Topics” anyway.
Question 2: Imho, the conversation should only be moderated as far as necessary, like, when people cross lines e.g. by writing racist things, or talking about drugs or whatever. Just the same that would also be moderated here in the forums.
(Edit: I pressed “Reply” before reading the thread until the end, so it seems, most of what I said had already been said in the meantime. But at least I want to let you know that one can have this opinion even without using the chat themselves.
And, I might not use the chat, but I’m a happy member of the OGS forums community, so I also share the view that the community is very important and it’s the main thing that makes me want to spend time on OGS.)