stow works for user level as well (-d and -t options).
A while ago I had also started a fork of stow called optstow to set the defaults
to /opt and /opt/maemo and fix a design issue of stow:
it symlinks the shared directories like share/man if they don't exist
in the /opt/maemo yet -> the symlinks of all subsequently installed packages
are stored in the directory of the first package. So I was planning to filter common
directories and to create instead of symlinking them.