I am hearing conflicting responses about the ability to add a throttle to the Shadow. I have reached out to Motiv on their Facebook site and they said that it can't be done. They told me that they could trade out the pedal assist for a throttle off of one of their Sparks, but I couldn't have both. I really like the Shadow, but when I test rode it I got stuck at a light in a high gear twice. It takes a couple of spins of the pedal to get the pedal assist to activate and a twist throttle would be a great option.