I'd like to see a type scaling feature added to paragraph styles. When the project allows it I prefer to set up a "body" style and then base most of my copy styles on this one. Currently I make different header styles proportionally larger but if I ever need to change my body copy size I have to go back and change all the other head styles to match. It would be nice to set body to 10pt for instance, then set head 1 to 150% and head 2 to 125%. This would make head 1 15pt in reality and head 2 would be 12.5pt (maybe show this in parentheses similar to the way scaled type shows the current size vs the actual size).
Stuart McCoy commented
I forgot to add that changing the size of body to 11pt, for instance, would then change head 1 to 16.5pt and head 2 would now be 13.75. All this would happen without my having to change the paragraph styles for head 1 and head 2 at all. Any font setting could be a percentage as well, making it easier to scale font sizes and spacing dynamically with one master style.