Thank you for great ideas, contacted Pegasus for info on Burn E2/Max. Might be a good option.
Looked at Yume M10 and X11, looked great, yet seems like they trigger throttle (not good for me).
Also, came across Solar and Lunar scooters - seems very powerfull, but seems to have twist throttle - not sure, very much not sure about it. I know thomb was very easy to operate, and - more importanly - difficult to over push to go faster than inteded.
Any other options anyone can think of for off-road riding on steep grassed hills and off-road trails, so was looking for 11″ Off-Road tires, and thumb throttle…..