A rich experience, with which users of Apple Finder and Mac OS X are accustomed, can not be guaranteed within the limitations of a protocol such as FTP.
Hint: Finder does very much more than simply transfer files. Much of the Finder experience, which users (naturally) take for granted, is thanks to extensive use of extended attributes and metadata.
Users of FTP, SFTP and SHH services: please, pay attention! The best marriage of Apple Finder and Mac OS X to a remote file system is: Apple Filing Protocol (AFP).
MacFUSE allows access to a volume only to the user who mounted the volume. All other users, including the superuser is denied access
nontrivial user-space file systems can still be complex, and their performance/behavior can depend upon numerous factors besides MacFUSE itself
When in doubt, feel free to post your questions on the macfuse group
MacFUSE itself isn't a distributed remote file system