Make it easy for people to create accounts AND contribute first comment/ticket

@nickm had an interesting point for a Gitlab Lobby to avoid the round-trip for new users who wants to submit a ticket/comment:

Users should have a way to request an account + submit their first issue or comment in one go, instead of having to first create an account, then wait to get access to the account, then submit their issue. This could lead some people who otherwise would prefer the anonymous account (for ease) to create an account.