It would be fantastic if there could be an hour/minute/second timer built into goodnotes. My purpose is for taking notes on movies and tv episodes since I work in post production, but I could see this being useful for taking notes during video lectures etc to be able to reference back to a certain timecode easily, or have a time of day stamped to notes. How I could see it implemented is pressing a tool in the toolbar, followed by pressing on the paper, dropping the timecode onto that spot. Maybe long pressing the tool could allow you to reset and select the timer. Perhaps this is a little niche, but I think it could be useful for many people!