Text formatting in comments to documents being reviewed on WF

It would be really useful to be able to italicise/bold/superscript copy in a comment that we want to include as new copy in a document that is being reviewed. At the moment, we need to type out the copy that is to be inserted and then add separate notes to design to let them know what is to be italicised/bold/superscripted. Also, it would be good to be able to add more that one format to the copy, e.g. italicised and bold