Before we make an RC1 we should have fixed all the known issues or moved them to 2.4.
I also don't think that the default use of db and file we have now is the best thing.
We have dbfile for inbox and spool repositories.
We have file for default repository destinations (see ToRepository mailet)
We have file for the outgoing spool repository.
Imho we should move to dbfile everything if we decide to have that as the default.
I don't like having the main spool as dbfile and outgoing as file.
My vote is +1 to move everything to file, db or dbfile.