Clicking mouse wheel is very inconvenient to look around in SketchUp. If the user has the capability of a 5 button mouse, the software should provide the capability to map wheel clicking functions to the 4th and 5th mouse button.
Furthermore, all 3D navigation is much easier when using WASD keys, irregardless of the application in mind.
The currently available shortcut customization is limited and not enough.
Here is a breakdown of the ideal keyboard and mouse navigation shortcut combination:
Left Click = Select
Roll Wheel = Zoom
Right Click = Open context menu
W = Orbit Up
S = Orbit Down
A = Orbit Left
D = Orbit Right
Shift W = Pan Up
Shift S = Pan Down
Shift A = Pan Left
Shift D = Pan Right
I really wanted to use SketchUp, but the current illogical navigation controls are an absolute dealbreaker.