One handy little plugin would be one that disables SEF on the front end for certain user roles, like Admin and Super admin. I know your better preview has this feature in the backend, but if it could be expanded to optionally suppress SEF for front end admins, this would be very handy, as sometimes clients copy sef urls for internal links, and when they later change the page/menu aliases, they don't realize this causes the old links to fail. Non sef for admin users on frontend would solve the problem.
Not sure... but can't you do this by changing the access level selection on the SEF plugin?
You might need to create a new access level that does not include admins.