I have things like Google Talk, Yahoo! Messenger that I do not want my blackberry users to use or even see. I have deleted them from the service books, but they come back.
These icons need to be gone and I do not want my users to be able to install them.
There are other 3rd party apps they can install, so a blanket - no app policy is no good.
The Service Exclusivity Policy Group already has them set to false.