Could you elaborate on what you mean by "document oriented db with version control"? Couch stores revision identifiers with every document ID, though old versions are subject to deletion whenever DB compaction occurs...
Essentially, objects have the ability to be rolled back, forward etc. Support for messages attached to commits and transactional commits would be nice!
An extensible user collection would also be nice, so app users are database users and vice versa.
An extensible user collection would also be nice, so app users are database users and vice versa.