The page about the wiki edit bit directed me to e-mail pgsql-www@, and I got a response very quickly.
Yes. pgsql-www goes to a public mailinglist, webmaster@ goes to a much smaller group. But webmaster@ is the appropriate location for a request like that.
The account/orglist page directed me to e-mail webmaster@ in order to be associated with a "Migrated Connection" project, which I did 25 hours ago, so I am not sure whether that went where it needed to or not.
That is in the queue to be handled by the team. As it's a smaller team, expect a bit longer response times.
I see that "PL/Java Project" is listed under Organisations as a Migrated Connection needing contact information.
Can an organisation have more than one contact set up? Thomas Hallgren is the creator of PL/Java and he hasn't gone away; if he has a community account it should certainly be listed with the project. (Is there a directory of community accounts I'd be able to look in? Perhaps his will be thhal, he has used that name elsewhere.)
Yes. The administrator of an organization can add more people as managers.