Add Side-chaining
This would be useful to place a side-chain compressor on a submix (music stems, FX, atmosphere) to listen to the VO track. Whenever the VO came on, the compressor would duck accordingly.
Even a dynamic EQ or multiband compressor could just duck out the mid range where the VO sits and leave the other elements in place to sound very natural and non-invasive.
Lack of side-chain is very cumbersome to duck submixed music stems. Please add this!!

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Trevor Asquerthian commented
The Beatrig Sidekick plugin seems to cause digital noise, certainly when used with submixes.
Far better for Adobe to replicate the side-chaining that is available in Audition.
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Dan Pearce commented
I know Adobe would argue Audition already does this but as a freelancer it's just not possible much of the time to do a 'final mix' in a separate application.
Often another freelancer will have to pick up a project I've worked on months later and quickly make amends.
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Stephen Pickering commented
I agree. AFAIK, the only plugin that Adobe allows this capability is Beatrig Sidekick Extended 6. So, the functionality does exist. But any DAW can easily perform this same task. Without the Beatrig Plugin, there are two, poor options.
Rendering to Audition or any other DAW is too time-consuming for such a simple task. Utilizing Essentials Sound hard-baked keyframing is not the on-the-fly audio ducking that editors need in a changing, creative sequence.