Is there a way to edit the navigation controls in the viewport to match the controls of the blender viewport? I'm totally used to rotate with MMB only and zoom in direction of the mouse cursor. It would be quite annoying to have 2 different ways to navigate now cause I intend to use Unity and Blender both now.
Nope. While Unity has added the ability to remap keybindings, nothing for the mouse or the associated modifier keys.