remux audio into a video after editing
Like Logic it would be useful to directly extract audio from a video, work on it and then remux it back to the video without having to re encode the whole material. Especially because I experienced audio bugs in premiere applying effects realtime in the mixer. When I encode the material it always fails and the audio isn't the same I edited in the program. I'm using built in audio plugins in the mixer both on tracks and master track. This is happening from the latest release. The doesn't affect the improvement which will still be useful anyway

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Seth Greene commented
Remuxing is an essential feature. IMHO it should be included in every program that can handle video and audio, like Media Encoder, Premiere, After Effects, and of course Audition.
An especially necessary feature of remuxing is also the ability to pass-through media streams unaltered (no reencoding, transcoding, etc.), to accelerate the process but also to retain original quality without unnecessary degradation.