Continuing the discussion from SketchUp 2016 is here!:
SketchUp communicates with peripherals using the drivers that are loaded on the operating system. For example, this has been an issue in the past with 3D Connexion devices, but we worked with them ahead of time so that they could release a new driver as soon as possible. With regard to a Magic Mouse, however, I would expect that to work without any driver changes. How is the mouse behaving?