View master bus / submix bus waveforms
Live waveforms for clip gain adjustment is great for balancing purposes. But they are pre any track effects / subsequent bus effects.
Be great to see a representation in the master track of a waveform showing how the export will appear. Help to catch and soften any peaks - spot any mis-panning etc by eye from the overall timeline.

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Matt Presson commented
Every time I open a multitrack session, I vertically zoom in just enough to not see the master track--it's wasted space. But if a preview of the mixdown waveform were in that space it would be SOOO useful. I find myself often mixing down, and then when I see the full waveform it immediately goes in the trash and I have to rework the multitrack and try again.
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Trevor Asquerthian commented
Similarly the option to show them for bus tracks too.