I don't find anything about it in search, so maybe i doesn't exist: is there a function, or an extension, to send an automatic private welcome message inside Byōbu (or maybe Whisper if it comes back, but less practical) to any new user after their registration?
The idea would be to send a message easily accessible and easy to find for newcomers, in which I could sum up to them all the links to the topics with rules, the topic with help to edit messages, the topic in which they can introduce themselves, etc.
There is the welcome banner for that, but it will be quickly closed by user (who can't come back to it afterwards), and it wouldn't be very ergonomic to keep it on top constantly.
Does such a thing exists? And if not, would it be a possible fork extension for Byōbu?