> Quite aside from that, [retaining the true creator of a file] would
> be a fairly large filesystem change, because it would mean changing
> all directories to record link creator information (or else doing so
> only for sticky directories, and forbidding setting the sticky bit
> on a non-empty directory).

True, it's much easier to forbid creating things that you cannot erase.
The "make a subdir in a sticky dir" hack is a reasonable solution.

~Ken