I think Robert's point was that you should be configuring pqm-submit to submit to a public location that any developer has access to, and have PQM configured to map that location to whatever it needs to push/pull the branch.
The bzr project uses a submit branch of http://bazaar-vcs.org/bzr/bzr.dev and that is not a URL writable by the PQM instance, so it should definitely be possible.
I think Robert's point was that you should be configuring pqm-submit to submit to a public location that any developer has access to, and have PQM configured to map that location to whatever it needs to push/pull the branch.
The bzr project uses a submit branch of http:// bazaar- vcs.org/ bzr/bzr. dev and that is not a URL writable by the PQM instance, so it should definitely be possible.