yeah just create a category. While in that category click ASSIGN ROLES and give all of those teachers the STUDENT role within that category.
Now if you want to hide that category, so real students aren't wandering in, that is the same problem I am having now.
you can follow my discussion at:
http://moodle.org/mod/forum/discuss.php?d=110508
That might help you cover some ground.
Roles and permissions
Setting multiple roles
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