I noticed that the /usr/local hierarchy is group-owned by the `staff' user, so another approach that I'm trying now would be like this:
- Make (or add) a user belonging to the `staff' group.
- Ensure /usr/local/{share,lib}/perl/$VERSION is group-writeable by `staff'.
- Set up CPAN{,PLUS} to disable installing modules as root (even via sudo)
- Invoke CPAN{,PLUS} as the user above to install modules.
So far so good, I have successfully installed the Titanium bundle this way, with the only stumbling being updating the Test::Simple module (which I worked around by running perl Makefile.PL INSTALLDIRS=site). I imagine this may be the case for modules shipped in the Debian perl-base and perl-modules packages.
A side effect of this is that files of the newly-installed modules will be owned by that specific user in the `staff' group, which is great if you plan to keep you CPAN{,PLUS} installations managed by a single user.
edit: this is essentially option 2 above, except there's no need to make another `local_admin' group as there's a `staff' group already (designated in Debian as the group for junior sysadmins, see Securing Debian HOWTO)
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