1. Palmer Performance is currently adding support for the new protocols (enhanced packages).
2. They are open to suggestions. If you have ideas, feel free to post it on the forum or contact them directly.
3. Yes. One benifit to adding these protocols is that it allows users to hack their vehicle. We rented a Chevy, in within a couple hours we were writing custom messages on the dash. We were also able to tell which seat belts were engaged and door locks. We could also control a few of the external lights (eg: brake lights).
4. I can't make any promises, but I know Palmer has been working hard to add the new functionality.
5. They are running the same firmware for the OBD-II protocols, so they will support the same range of vehicles.