Interesting idea but I would imagine such a mode would quickly wreak major havoc with moderate to complex timelines due to their precise placement of multiple tracks and all the desired interrelations. Undoing would be quite the headache.
FCPX sort of does something like this already in terms of being able to swap around sections with relative ease but it requires a timeline clustered around a single master track vs. the multitrack timeline in Resolve and most other NLEs.
Noah
FCPWORKS – Workflow