I would love to install OVMS onto my Nissan Leaf and Vauxhall Ampera. I know the Leaf one is still very early days but who knows? I might be able to help with development!
The thing is that I really don't want to do anything that runs the risk of invalidating the warranty on either of the cars.
My Ampera dealer was perfectly ok about unplugging my OVMS module to do a service and upgrades etc and re-plugging it back in before returning the car to me. They were quite amused that I could remotely spot if their driver was breaking the speed limit. I wish it didn't lose contact with the networks so frequently, but that is another story.
I would think that there could be no grounds to escape warranty obligations unless the port was fried, perhaps.