When documenting bugs, capturing screenshots is the most labor intensive step.
It would be absolutely AMAZING to allow your rich-text editor to paste a screenshot from the clipboard directly inline with the text. Upon paste, the image data is uploaded to the server and the embed-url is immediately added to the rich content. You could do fancy things like show a thumbnail of the image and allow it to be shown 100% in a popout.
AFTER the initial release (which would be instantly valuable) you could add features like cropping and highlighting.