m2 users will not be able to use development m1 repos as effectively without repoclean processing the poms.
But we want ibiblio clean from unreleased stuff.
Systems like Yum have a Base, stable, development, test primary repo. We can do similarly.
Add a primary development repo and sync in nightlies, converting m1 snapshots.
Purge it regularly (eg keep only the greater of X days and Y builds)
sync it to a mirror.
suck in from cvs.apache.org/repository, jpox nightlies, and any snapshots that came through the main channels