Howdy!
I was looking at the "riding a bike backwards" thread elsewhere. Although at first the posts seem to criticize, I have seen recent ones with good thoughts.
Here's mine. How about, in the shot above, when you Right click something and move your cursor along the options, a little "What's this" (or big and detailed) explanation box would appear to the right, in this case, what's a selection set?
It could be totally optional for the experienced user, and perhaps have an "intermediate" Clue Only setting, for people well on their way to proficiency.
Thanks!
Nelson