Would love the ability to have my comment drafts saved for at least a short period of time. Other project tools (trello and basecamp) we utilize do a great job at handling this.
So far I've had numerous comments get lost due to accidentally triggering a feature or miscalculating an interaction. Most recently I had a multi paragraph comment evaporate before me when I attempted to drag and drop a file into said comment. Instead of hitting the drop zone, I accidentally hit the text input directly above it. This caused the image to open in the tab. I quickly hit the back button, but it was too late. My comment had passed. (sad panda)