Non standard ACL on new users

Hi there.
I have just begun testing out this component and I must say I am very impressed.
I have a few quick questions.

On my site, on registratation, users have to submit a password (it´s per invite only) and then select a usergroup (like teacher, student, and so on).
All these users are automatically given Author access to the front-end of the site.
-These are my privileged users, and I want to offer them the best prices.

Now, other users should be able to use the store as well, but not at the same terms.
Problem is, if a user registers through hikashop, they will now also automatically be given author access.
Is there a way to give them only a registered status, without manually editing each?

I tried turning off the plugin called hikashop user synchronization, but still the user is being registered in the default joomla users table.
Ideally users would be given a registered status, but as hikashop seems to have its own user table, having new members only show up in this table would work as well.

Hope to hear from you.

Alright, great. If I end of using this component, I will buy it to show my support anyway:)
I am guessing I already have gotten the answer, but just in case;

Yes, I know I can change the default user type from the joomla backend,but I am curious as to if hikashop can override this?
I want the default usertype to be Author (this means the user have registered through the invite system), users that have registered through hikashop should also be granted access, although a lower grade (registered).

Thank you for the super quick reply:)

Perfect, just what I needed to know.
I´m buying:)

Have a good night,

Julian