A bit late, and not really ready, but jappixmini has a new feature: The administrator can now specify the address of a eJabberd server and Bosh host he operates.
He can configure his eJabberd so that it authenticates against Friendica (using a so-called extauth script which can be downloaded from the jappixmini addon admin settings).
This means that the user effectively does not have to configure anything - he gets a Jabber account automatically, with the same credentials as his Friendica account.
Brave server admins can test it already
It's not in the official repository yet, but at
Currently, if the admin activates this functionality, users can not override this, but I want to change this later.