Quote - Is it possible to add Walk Designer support for V4 and M4?

Yes, see the relevant items by Nerd3D -> http://www.daz3d.com/i/shop/artistlist?artist=1639

Quote - can a pose or light file delete specific lights, if I specify lights by name?

No, a pose file could probably selectively turn lights on or off.
Light file behaviour is controlled by a preference (choice of whether current lights are turned of or not).

Quote - can i make the ui Dots default to Camera?  general pref don't seem to save UI dots prefs.

Not unless the selected tab is specified/specifiable in the relevant UI XML file.