When a moderator moves comments to chat, the operation adds a comment that says:
Comments are not for extended discussion; this conversation has been moved to chat (link).
That's good as far as it goes, but sometimes users treat that as information when we want them to change their behavior on this post. So we get things like this:
That's actually one of our milder cases; often that "show N more comments" link is a double-digit number and it doesn't always begin with "1".
Now not all post-chat-link comments should go to chat; ones requesting clarification should stay as comments. But in my experience, most of the time what happens is more conversation. We can't easily add those additional comments to the chat room, so usually we just delete them. But it's work that we might be able to avoid with better guidance.
Moderators can edit this comment text, and I'll try to remember to do so when I move comments to chat, but it would help if the canned text were a little more instructive -- something like this:
Comments are not for extended discussion. This conversation has been moved to chat (link); go there to continue the conversation.
If a moderator feels that last part isn't needed in some cases, it can be edited out. It's easier to delete than to (remember to and) add. Most of the time, on some of my sites, it's needed.
Just telling people a fact isn't always enough. Please make it easy for us to also give this instruction.
I have high hopes that it took me longer to write this feature request than it will take somebody to make this change. :-)