Double roles in the user create page

Hello,

first of all.. Thanks for this useful module!

I there is the Module "Administer user by role" http://drupal.org/project/administerusersbyrole installed there is a double role delegation in the user create page. I this it was a nice feature to hide the role delegation field ind the user create page if ther module http://drupal.org/project/administerusersbyrole is installed.
I attached a screenshot.

Thanks in advanced!

Best regards
Frank