A few questions + 1 - are there any replacement key fobs for the sks on the prius? Any integrate remote start? 2 - what mods are available for the stock navi system? Ie, rear cam while driving, using nav while driving, playing dvds, etc? Nexus S ?
Toyota sells a remote start option, and I'm betting replacement key fobs are available on eBay. Not sure about playing DVDs, or having the camera active while driving, but there are certain functions on the factory Nav that are not available while driving. There is an aftermarket device that will overide the lock-outs, but it's expensive, and I don't think it enables the rear camera, and I'm not sure if the factory Nav is even capable of playing DVDs.
It is offered through the Prius Chat Store, and it looks as though it comes with a new remote: http://priuschat.com/shop/product_info.php/cPath/12/products_id/138