THE FIRST MOUSE MERGING 2 JOYSTICKS
By adding a mini joystick for the thumb and the second place in the inner area of the mouse, today, players can combine actions, fight with complex combos, control their map or vehicle, all performed with a single hand. No more toying.
... It is not cheap, but looks like something perfectly usable in games type "flight simulator". Maybe something what I can use for my notebook when play Elite Dangerous.