So....
I did some final polishing of the "off" buttons (they look a bit better now IMO), and also made media player use it.
This means that from my perspective, we're essentially done for now (at least concerning all required tools), so I declare the toolchain as
Version 1.0. Thanks a lot to everyone who was involved in making this possible!
I'll update the first post accordingly.
Update: @diba: I saw you already created a distribution bundle on mexxbooks. Please update it with the 20120213.bin, there have been a few last-minute changes to 2 translations and the bookmarks (+ the media player "off" button).