re: "Ya I agree the thumb throttle is much easier and comfortable on longer rides. Cause
after I while the twist throttle puts strain on your wrist"
Why not bend your wrist more when grabbing the throttle, so the wrist is straight when you are at your riding position?
I think the grubee type throttle is a little annoying. I understand it's supposed to be like a motorcycle, but I didn't really care for it. I was going to shorten the throttle twist portion to the minimal length and install regular bike grips with grip glue. Someone on youtube used a cheap twist shifter with the metal spring clip removed, as a throttle twister. It had plenty of cable pull.
re: Staton Thumb Throttle.
I got one and I like it, but it's not on a bike right now. I wanted to use it similar to a v-brake lever throttle, but I have too much stuff on the bars (integrated mtn bike shifter/v-brakes). I figured out I could use it by mounting it opposite the brake lever, so the web of the thumb or palm of the hand presses it to the bar. This works ok, especially if you want to have an on/off throttle switch, with a little room to maneuver around slower things occasionally.
It is plastic, but it looks well made and feels nice. It lays flat against the bar and the hinge is small. It takes standard brake cables, or you can use solder-on brass cable stops. (not the Happytime type clutch cable end!)