Scribble notes into timeline
Here's the idea. When you are editing on the timeline, you are sometimes faced with different options. Things you may want to explore at a different time, edits that you are not sure of.
What if you could use an easy scribbling tool, to make notes INSIDE the timeline? Like a roll-down panel where you could write with the wacom pencil, the mouse or keyboard? Then, after editing was done, simply select the whole layer and clear it, or just clear the fragments where needed.
Also this would make for a wonderful tool to hand over a project to another editor, where you could draw in your important remarks.
Sami Succar commented
That sounds a lot like what markers do.