Transmitter thumb flick

[rondoolaa]

Hi, I tend to flick the thumb sticks on my transmitter when driving and have done for 35 years, I've been told my car will handle better if I stop flicking the throttle, I'm finding it hard to not flick the throttle stick, can anyone recommend anything that could help me out, I was hoping to find a rubber stick cap that would fix onto my thumb with a strap but can't find anything...

Thanks for any advice.