gpgkeys_hkpms should be able to use a SOCKSv5 proxy.
The hkpms transport for gpg currently makes its connections directly through the OS's network stack.
Apparently, some tor users would prefer to connect directly through tor, but without using an onion address.
We could enable this through a @--keyserver-option@ that points to a socks proxy, maybe using "LWP::Protocol::Socks":http://search.cpan.org/dist/LWP-Protocol-socks/
(from redmine: created on 2010-12-17, closed on 2010-12-20)