Can I over-ride my chat?

Ie. can I stop broadcasting when I hit return, and then start again on next return?

technically, yes... whether or not that would work well will be up to personal taste.

go to keyclone/setup/override settings and you'll see 'override hotkey' and 'override hotkey #2'
click in the box to the right of each field and hit the key you want.

thanks! I suppose thinking about it, it's probably easier to just pause all broadcasting when chatting anyways