User Role dependant registration

Would it be possible to make it work only for specific role?

example:
Subscriber should be able to be registered the normal way
Author should be approved by administrator

I’m looking for a solution to create different registration forms for each role, so it would be great if I could also implement this feature for specific role registration.

thank you!

http://ww.wp.xz.cn/extend/plugins/new-user-approve/