I am afraid I cannot do that, it will not be accepted by testers Every installed application from repositories must have the option of uninstalling it... and my goal is to have it in repositories, so everyone can use it, even not experienced user, that have no idea how to instal gstreamer-tools themselves.

But..., I have a version (not published yet for above reasons), that does not show itself in "Uninstall" part of application manager and does not allow you to remove it with dpkg I will upload this version later to the garage, tonight or tomorrow night