Sure, ideally, I would like to see Tesla open up its self-driving systems to new inputs and modifications, and just disclaim all liability for the consequences.

Sure, ideally, I would like to see Tesla open up its self-driving systems to new inputs and modifications, and just disclaim all liability for the consequences. I think it would promote more innovation and novel uses for the software. However, Tesla is aware that they (and others developing automobile autonomy systems) are under scrutiny, and that, in the eyes of the public, the media, and regulators, they simply cannot divest themselves of liability. This is especially true because of the hazardous nature of cars and the novelty of the technology. They've already been publically embarrassed by having one of their cars hacked into. I do not think they have any appetite for opening up a novel flagship product to unapproved mucking-about, and I cannot honestly blame them. They are covering their asses.