Copy/Reference Comments On Older Version in New Version

Something that would really be helpful would to be to optionall overlay/copy the comments of older versions onto a new version. 

Here's the use case:

I'm working on a video and we get some comments from a client to change a specific shot or edit something at a timecode. We make the change, and upload the new version. We need to continue talking about or reference this comment to keep the conversation going about this specific change. 

As it stands right now, all old comments are lost with new versions – you can switch to the older version but clients aren't going to do that and it doesn't really make sense. So currently we have to go in and find that change at the specific time, make a new comment to keep the conversation going. When you have very long videos this gets tedious. It would be great to somehow copy over that comment from that specific user or reference it somehow, instead of it completely being locked in older versions.

This would also be useful for times when a new reviewer steps in and has no idea what has been done or why. Or when we have long videos and just need to pinpoint a specific time. The ability to reference older comments/notes would be great. 

Basically we need to be able to compare old/new versions in one place.