I use this setting with Thrusmaster Target Script and it works great for me in DCS World:
MapAxis(&Throttle, SCX, MOUSE_X_AXIS, AXIS_NORMAL, MAP_RELATIVE);
SetSCurve(&Throttle, SCX, 0, 10, 0, 3, -4);
MapAxis(&Throttle, SCY, MOUSE_Y_AXIS, AXIS_NORMAL, MAP_RELATIVE);
SetSCurve(&Throttle, SCY, 0, 10, 0, 3, -4);