Keep 1 pinned comment in the email view at all times

When you make a new comment, it shows on the email "feed" (the section between the opened email and the left sidebar where all the emails are), but when someone replies, the comment disappears from the "feed". You can still find it if you open the specific as it will be on top of the latest reply(or at the very top if you pin it by clicking on the little pin), but it still disappears from the "feed". It would be nice if we could keep a note "all the time" on the feed even after new replies come in. It helps to give a quick description of the email thread or what "to do" of all my emails just scrolling down on my 'feed" instead of having to click every email to find my note.

Basically, we should be able to choose from the pin notes which one we want to "Stay" on the email feed at all times.