Create URL for Private Message to Multiple Recipients

Hi

I can use this URL https://community.khoros.com/t5/notes/composepage/note-to-user-id/106204 to open a private message page with one recipient already selected.

Is there a way out of the box to do this for multiple recipients using a list of user ids (or any identifier username is fine as well)?

Also, would it be possible to have the broadcast message checkbox already checked as well?

Lastly, is there a list somewhere of URL parameters that can be used with this URL?

Thanks!