I came from using Pro/E and Solid Edge. The middle mouse button function for spinning the model is backwards from these (and from Solid Works, too). Search through the posts; most people want the middle mouse button to rotate the model when it is pressed, and then if they want to pan then hold down an additional key like Shift. Why not just let the user decide how they want this to function? Dont hard-code it; make it part of the customization.
If you think it's not that big of a deal look through the posts.
Yes, I know about 3D controllers; I've used them for eight years or so. That not the point; unless AutoDesk is getting a kickback from 3D Connexion, there is not a good reason to hard-code this functionality backwards from what the other programs are doing.
I read that Inventor users suggested how this would work; they were wrong. Perhaps they had never used another 3D CAD program? Not sure, but the rest of the 3D CAD world got it right. The development team propagated this error by hard-coding the behavior instead of letting the end user decide.