It would be great to mute/un-mute or even adjust volume of individual audio channels. This affects a vast array of industries. Whether you're tracking separate audio streams in a stereo channel or dealing with 5.1. Everything from film shoots to post-production workflows would benefit greatly from having this control and this is a feature that no competitors have.
One example we run into often is that we'll have timecode on one stereo audio channel and program audio on the other. We have to render a separate video for Replay that mutes the timecode channel. With this feature, we could cut that from our workflow.