A somewhat silly use for this also occured to me since we can see the status of various buttons and switches in the car by monitoring the CAN bus. Here are 2 ideas:
This can be used to enter a 'code' to activate something or to identify the driver to the carputer. A code such as tapping the brake 5 times quickly.
Or we can repurpose buttons for something else. I found the bit that shows whether the key is inserted into the slot beneath the VDC button (I'll add it to my spreadsheet soon). It's just a button that can be pushed if you insert your finger all the way back. Just monitoring this bit can activate something and it makes for a very stealthy switch.
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