I'm hoping very passionately that V4 will get full customization options for navigation (zoon, pan and orbit fully assignable to custom keyboard keys and mouse buttons, and reversable in direction). It would help a great deal in a seamless transition between MoI and other tools, as you're navigating at least half of the time you spend in an editor, and muscle memory keeps bothering you when you've just used other navigation controls for a couple of hours.

Thanks,