Crazy idea but what about a camera placed in a way that Tesla would capture footage of the brake and accelerator. Store up to X minutes/hours of that would come in helpful when combined with the other data they collect.
Look, a carpet snagged on pedals a few years ago and that was sufficient to cause a recall.
http://www.consumerreports.org/cro/news/2011/02/toyota-annou...
That's the level of service I'd expect from any major auto-company. Just because the pedal was down doesn't necessarily mean that we've got driver-error going on here.