Would /job/ redirect to /jobs/ ? Otherwise it breaks removing the last part of path in the address bar, or clicking the up button in Konqueror (at least when I was using it a few years ago; I don't know if it still has an up button by default).

BTW I think in the case of pull requests, pulls isn't a nice shortened version of pull_requests, and pull_requests is just too long for how often it's used. GitHub still uses the plural form for issues. https://github.com/kriszyp/rql/issues/14