I guess if you want to shut the kids up in the back, all you have to do is floor it.
Sounds like they may be pretty much immobilized.
http://www.teslamotors.com/models/features#/interior
The rear facing child seat option provides seating for seven. Optimized for safety and equipped with 5-point seatbelts, the bucket seats provide a comfortable ride for children under the age of 10.