Choosing which group(s) to register

Don't you think providing users with a password is the best way to prevent abuse?  Admin should have a broader range of options when allowing users to register in groups. On a news site, all editors would have a code to register with and be allowed to enter a specific group...

In that case admin better register users manually himself. I understand your request but I think it's specific to your case and it will be of no or little use to general user base. But of course, if I get more requests for this feature I will consider it.