Sorry if this is included in what you plan but just in case ....

Maybe a panel to play with fog and clipping ranges 'live' would be useful as well?

Do I understand you will not be able to change static lights -only dynamic? If this is the case might it be possible to do something like use static lights to 'emulate' a static light in the live view and then 'save as static light' and place a static light in that position with those setting automatically in WED? This way you can play with lighting a scene and when you have the a nice configuration generate the static lights and build. Ignore me if I misunderstood.

[EDIT: Ignore I see this is already planned ....]