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The "doug.callback" command has a type called "update" which is called any time the scene changes, and which can be limited to certain nodes with the -nodes argument.
This is a request for a new callback type which will call tcl code any time a view is modified. Of particular interest would be events when a new camera is assigned to the view, and when the viewport size changes. Although, i suppose you could also notify if the flags on a viewport change.