I will be the first to admit that I have no clue what I am talking about here so don't yell at me if this is a stupid question.
I know Tesla recently came out with the dual electric motor setup but before they did that I was thinking about the fact that all that rotational energy from the front wheels was essentially being wasted. Would it be possible to, instead of putting a motor in the front, put a generator in the front or run the front motor in reverse all the time so that as you drive you are drawing energy to power the rear motor but simultaneously using the front wheels' motion to generate electricity to recharge the battery. I realize that is basically what you are doing with regen braking, but my question is could you have it do that all the time? Or do the laws of physics just go NO and then proceed to give you a dope slap for even suggesting such nonsense?