paths on Mac OS X can be improved in the following way:
1) default themes, visuals, languages and plugins should be in the application bundle in addition to the folders in Application Support.
2) resources, sounds and fonts should only be in the application bundle
3) some cleanup for Application Support, i.e. no Info.plist, no COPYING.txt
4) checking for duplicates (songs, themes, languages, plugins) and ask user, whether they should be removed