You might be able to set up a macro for this:
<Alt-v> N (tab) (space) (Shift-up or down arrow until the entire list is selected) <Alt-o> (tab) (tab) (space)
That makes all the rats nests disappear. You'll probably need a basic script to do it on a net by net basis.
1. I believe nudge only works in router. It will 'nudge' traces out of the way while you are routing.
3. You can make it <read-only> from File Explorer.