Is the CSSU effort still alive?
I've been doing some updating efforts of my own and have ported Maemo 4.x API changes to new versions of glib, libpixmap, cairo, pango, and atk. My idea is to get a brand new GTK+ stack on the tablets.
Another CSSU could be possible, it just depends on ourselves. I wanted to do an update with some of the diablo-turbo fixes, but because of lack of time I didn't fixed the packaging yet. We also have the applet desktop locking patch, and bstern patches. We just need to put everything together with proper packaging.