Often times when writing documentation, it's best to try to get things sketched out as fast as possible and fill in any missing details later. It would be nice to be able to highlight a piece of text that's unfinished and mark it as 'todo later' with a comment and/or assign it to someone on our team. For example, I may write documentation and need some pics later. I'd love to be able to use a placeholder pic and tag it to be replaced later and then send all the images tagged this way to the design/marketing team to fix in a nice clear list.