One of the things I hate about using new 3D software is all of the controls are always different. I'm a long time user of SOLIDWORKS (18 years) and usually try to modify settings to match SOLIDWORKS as much as possible. I'm pretty close in Simplyf3D. I would request the Middle mouse button reset would require a double click (on the middle mouse wheel). Changing Rotate view to Middle button, and Pan View to Alt + Middle Button gets me most of the way there. Misreading those clicks when trying to rotate or pan also causes a view reset. I would also suggest a slight name change. In Cad we would call this a Zoom All or Zoom fit.