Here's a forward/reverse demo after configuring throttle to a "wig wag". It lets you get forward/reverse/brake all in one little twist grip throttle.
GerryAZ: This is my own controller. I did the software/hardware/pcbs. It's all open so you can use or modify whatever you like. I also make and sell completed and tested boards that you can plug right into 3 IGBT half bridges. Then if you add a bus capacitor, you are basically done with a full inverter. Here's an instructables on how to put everything together on an older board I had done:
The process can be a lot easier than that if you get some basic 2-terminal film capacitors instead of the 16 terminal ring caps.
Great question about the Leaf motor cooling! I'm going to run some temperature tests so soon I'll be able to answer that question.