Hey Steve, seems to work fine in all modes. The screen coord widget is how I imagined it'd be, I think it's fine.
The outer screen Z-axis circle doesn't work anymore though, is that intentional? It's useful to have that regardless of what coord system is selected.
Lastly and kind of related, I notice that mouse-over highlighting doesn't work for anything when fast select is off. I always work in fast select mode so I never noticed, but I think it's a useful feature to implement universally.