i suggest that GtkFileChooser should ignore local_only if there is a running gvfs-fuse-daemon, because the documentation says:

"If local_only is TRUE (the default), then the selected file are files are guaranteed to be accessible through the operating systems native file file system..."

the fuse-daemon provides a way to access any gvfs accessible files through the os, so all files/paths should be selectable.

gtk_file_chooser_get_filename() should return the translated ~/.gvfs/... path in that case. (possibly it should still return NULL if local_only is not set in order to allow applications to do optimizations for truely local files.)

example use case: save an attachment from thunderbird. it is possible to save it anywhere by going through ~/.gvfs/, but that should be done transparently.