It would be really useful if, say, the Inspector could be opened into a separate, free-floating window that could be expanded to full-screen size and could then be be viewed on a second monitor or “paged” with Alt-Escape.
The split editor is another window that should float.
Scrivener does this already with Project Notes (but not Document Notes). Would it be that much of a challenge to extend that capability to the Inspector and the split screen editor?
“Quick Reference” panels will coming to a future version (something already featured in the Mac version). These offer the ability to open any document in a free-floating window, and show the notes, synopsis etc alongside the document in that window.