It would be nice to integrate this with the folders hack as an all in one package.
It will be integrated soon. Open questions at the moment are:
1) what about prs 500? (I guess it doesn't have any epub support, does it?) (offtopic: I wonder about legal issues, if we just slap it onto prs 500, if it's not there yet)
2) How to use /database/system/.. folder for custom css. Isn't it possible to resize .so's symbol table? Symlinks solution is not as nice.