Hi Ozh,
I do appreciate the feedback and the review. WP core doesn't currently support removing a custom post type via a filter, so we haven't added anything to the Jetpack plugin to do this at this time. (See this for more info).
In the meantime, I put together a mini-plugin for you that should give you your requested functionality:
https://dl.dropbox.com/u/92961364/jetpack-cpt-remover.zip
Let me know if that helps.
Thanks,
Tim