Following my earlier post, here are two workarounds. I am afraid they apply only to owners of a Wacom drawing slate. Most Sketchup users work with a mouse, however plenty of Sketchup users use other graphics software as well for which they may own a slate. So if you are one of those and suffer from the Renditioner 'extreme high gear' navigation syndrome this might be for you.1) If you own a recent generation Wacom
Built in to the Wacom control panel is mode called Precision Mode. You can map this to one of the buttons on the side of the drawing slate. In precision mode the cursor is slowed down and can make very tiny precise movements. You can leave your slate in normal mode for all normal usage in Renditioner such as dragging textures and switch to Precision Mode just for navigation. It works fine. I use this in Sketchup itself as well for dragging to precise dimensions. I appreciate that using a slate for 3D is not a usual procedure - most modellers prefer the mouse. However if you have a Wacom for other graphic applications then, even if you don't use it for Sketchup, you can call it into service in precision mode just for Renditioner navigation and use your mouse for everything else.2) If you own an earlier generation Wacom
This is a less satisfactory workaround as you will not be able to use your slate in Sketchup or Renditioner for normal cursor movement. However if you work with a mouse and have an idle Wacom you can set it up just for Renditioner navigation.
In the Wacom control panel set up a Sketchup specific Wacom profile that is only 'live' when Sketchup is running. (If you don't know how do this it is clearly explained in the Wacom manual. It's very simple.)
Then go to the Mapping tab:
Set mode to Pen.
Select Portion from the Screen Area drop dialogue.
In the new dialogue box drag the screen area handles to create a small rectangle in the centre of the screen about one quarter to one third of screen width and height.
Click OK to return to main dialogue.
In the Tablet Area drop down select Full.
This will produce very tiny movements of the cursor on screen for large movements of your pen. A home made equivalent of the precision mode of the newer generation slates.
When Sketchup is running the Wacom controller will automatically switch your slate to this new mode.
You may find it a bit disconcerting to begin with as you will be unable to move the cursor with the Pen outside the small central portion of the screen. But now you can do everything else with your mouse and simply pick up your pen to navigate in Renditioner.Note for both methods.
If you have never used a Pen for 3D navigation before then it feels and behaves slightly differently to a mouse - but it only takes a few minutes to get completely used to it.
I don't pretend either of these are ideal, but they DO tame the beast that lurks in Renditioner navigating for some users.