Would be nice to cross out text, like is possible with OneNote using the font function.
Would also be nice to have the ability to collapse text on a page. This would mean that certain text on a page would have to be a child to other text.
One of the things I use Outline for is to maintain a running list of open items that are being worked. With OneNote I crossed out lines as they were completed. Having the ability in Outline to cross out the line in the way that can be done with OneNote would be helpful. Being able to also collapse the portion of text on a page would be amazing.