This might sound a little weird, but I think it’d be nice to have 2 or 3 volume sliders (for music, sfx, and dialogue). It’s a feature that hasn’t been used in any game since CE, which is a shame since it has a lot of versatility. Content creators can benefit a lot from clean samples of weapon sounds and dialogue, and having the option to lower the soundtrack lets people play without their own music cutting into the game’s.
Extracting audio is something modders will inevitably do (as they have done with every game in the series thus far), but it’d be nice to let players have a simpler way to do it.