OrbitControls on mousemove

Is it possible to use OrbitControls to rotate without mousedown, just on mousemove.
Maybe is there better way to do this than to use OrbitControls?

No, this is not possible. OrbitControls only allows to configure the mouse buttons that trigger rotate, dolly and pan. But you can’t define that plain mouse movement rotates the camera. You need a custom version of OrbitControls to implement this use case.