User Account questions

Hey,

i love anspress very much. but i have a few questions about it:

1. Is it possibly to disable all userlinks that leads to the useraccount?
2. when i go to a page of a user with the name e.g. “usertest” than appears in the browser the email address of the user instead of the user name. like www.test.com/[email protected]. It need to be www.test.com/usertest – can i manage this?
3. I turned the function off that the users can change their background in their accounts. can i uploud a differnet background as for default?

hope you understand me questions.

Thanks