Two things have been discussed here:
OP's request to reinstate a private chat feature that is similar like Whisper, @davwheat seems to have a fork. I would suggest he publishes that as MIT under minimal maintenance (look at how @clarkwinkelmann does that for some of his extensions). Clearly mention fixes and features are only implemented when paid for; direct to Blomstra (subcontracting) or Discuss (bounty) for options.
Suggestions by others about Byobu relating to:
- the private discussions mingling with others
- the privacy implication of messages being read by staff
- the need for a menu item that shows a count
I think these need to be separated if the expectation is that someone is going to need to take action on them. These can probably be moved into the Byobu discussion or started un Proposal with a potential outcome of being crowdfunded using a bounty.