I absolutely love the function of F7. If you have not discovered this gem yet hover over a verse in the bible, or over a reference in a commentary and press F7.
There is something else I would love to see with the push of a button while hovering over a reference, and that would be cross references. If the same kind of window with cross reference information was assigned to the F6 key, I would fall in love with the Function row once again. I'm already used to this function with the footnotes. It would seem so intuitive to have it pull in everything from NTSK and other translations' footnotes.