It seemed trivial enough, so I updated all systems (makefiles, xcode, scons, scons win installer), please complain if something went wrong. Mostly it was just removing release/bpydata references, since the release/scripts dir is already worked on recursevely, handling dirs inside it. For the scons nsi file writer script I had to write code for each new dir, but it can be recoded recursively, too (in fact joining all release stuff in a single dir tree with nothing else would be a good idea, making installation code simpler). Since it's just python and I have a little more time now, I can help scons managers if they still need. Thanks Campbell Barton for reporting.
This folder is for automatically saved scripts configuration data. To use this feature scripts just need to set a proper Blender.Registry key. To know more, check the API Reference doc (specifically the API_related and Registry parts) and the documentation for the "Scripts Config Editor" script.