General Inquiry about Customer accounts

Hello all,

I have successfully setup and have Trudesk working for my website but I just have a few questions about Customer accounts.

Question #1:
Why when a new customer creates an account for the Support site does it create a new group with the email that was used?

Question #2:
Why does the Customer have access to assign support staff users to their ticket.

Question #3:

Why is the customer about to see the dashboard of the site?

This might be an error on my part but I have not messed with any of the permissions form the install, all are stock the way the site was installed.