Giving selective permissions in a database
You'll have to grant them appropriate permissions at the database level to indicate what they should be able to do. Then grant ALTER permission (or make them the owner) on the schemas in which they can do these things.

GRANT CREATE TABLE, CREATE PROCEDURE TO [AD\dbusersgroup_limitedrights]
GRANT ALTER ON SCHEMA::[DIS] TO [AD\dbusersgroup_limitedrights]