There should be a really simple feature that says 'mute anyone who is not the speaker in this segment (what I highlight in the timeline script). It makes no sense at all to have to go into each cut - dozens maybe hundreds - and manually make an adjustment to weed out the bleed effects.
The second problem is that there is not a clean delineation for when the mute begins and when it ends. Literally, if I select a minute of script and mute a voice, that voice may be muted for 10 minutes further. Then, do I have to blade seperate every scene?