> So I would like to turn ReleaseBuilderFor4dot5 into the one and only
> ReleaseBuilder, delete the old 3.11-4.4 builders, ...

I totally agree with the above.

> ... and put
> ReleaseBuilder(Nihongo|Squeakland) into a separate package, loaded in
> during the release process but otherwise not in Trunk. (In other
> words, they go the same route as XML-Parser, Universes and so on.)

One thing I've been hoping for is a re-convergence of some of the
previously-forked Squeaks back into trunk and made into loadable
packages.  Etoys, for example.  That project could possibly benefit by
getting image fixes and an improved base image (based on trunk).
Squeak obviously benefits by having more neat, externally loadable
packages available.

So, while those packages themselves need to stay out of trunk, those
communities might need some sort of customization scripts to deploy
the image that their users expect.