I find the small size of the trackball makes navigating round in 3D really twitchy, too sensitive.
I use to use CATIA V4 for years, and it had very similar 3D manipulation, but the trackball was a lot bigger... moving the solid models around the on the screen was never an issue.
Could we have an option to change the size of the Trackball?
I guess it's set to a % of the viewport.
I seem to remember that it also only appeared when rotating the model, which was a nice feature too.
Sadly, as V4 is soooo old now, i can't find any screenshots showing it.
Cheers.