Better track management tools in timeline- Nest multiple tracks, un-nest tracks, re-order existing tracks,
Better track management on timeline.
-- Nest audio tracks
-- Un-nest feature to restore
-- Change order of tracks, drag and drop up and down
-- Ability to nest several tracks (shift click or command click to select)
-- Track selection box, draw it around the area of tracks you want to edit without effecting any clips or audio outside of that box selection. For example you might want to move a chunk of files, or only operate on a small section. Right now you only have all tracks forwards or all tracks backwards of the selection. Yes you can use the lock on tracks but that locks the entire track not just a section of a track.

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Ben Spear commented
Track selection box sounds like a fantastic idea, if we're thinking the same thing... do you mean having a selection tool like the Lasso tool in Illustrator? That would come in super handy rather than the normal rectangular selection area which can be quite limiting and make fine-tuning a selection a pain in the a**! Unless something like this already exists? Cheers!