I’ve already changed the tag on your post, so there’s no need to add another thread for this same thing.
I feel Scrivener already has plentiful tools for making remarks about snapshots. The inline annotation method works great if you know why you are taking the snapshot, but as you note it’s a bit unwieldy if you tend to think of things you want to say about the revision later on.
The overall larger problem that you are looking at improving is something I’ve given a lot of thought and refinement to in my own workflow. I often have a need for tracking a specific edit across multiple binder items, to have a place where I can jot down notes on that edit, as a process itself, have a list of what has been changed, and be able to look up snapshots that were related to that edit as well. I also want that to be something permanent, that I can look up years from now and have all of my notes under my fingertips, all of the snapshots I made, all of the sections in the binder that were edited because of a change, right there in a list.
I’ve written these thoughts, and my methods, in more detail in this post.
Once you’ve read through that and maybe experimented with the idea a bit: do we need more interface and features to put these notes on the snapshots themselves? Eh… maybe? But I don’t think it would add a whole lot to what we can already freely do, and with likely better tools than anything a little comment sticky note or whatever would give us. A feature which does nothing other than that one thing is something we do try to stay away from in Scrivener. We prefer to make features that can do a million things, because that’s how you end up doing stuff like what I described in the previous post. There is no “revision tracking system” in the software, not even slightly. But with the many freeform, simple, and interconnected features in the software we can make a system that I would dare say rivals anything elsewhere that was built more to purpose (and thus does very little else).