I guess there is only a small minority who tests the working branch. In the moment a new version is tested after release when users do an upgrade.
So I think of something like the Debian or Libreoffice release plan. This would mean for FOG in the time of writing that a very stable product like FOG 1.4 (at least for my use case) would receive further bug fixing without any new features.
Of course that would slow down the development of new features. But FOG is a software “for production” by nature so stabilty is very important not only for me I guess.