First, I love Power Lookup. Having it follow you so footnotes are right there without needing to hover is huge. One idea to make it even better: make Scripture references optional. I'm reading through a Greek Grammar textbook right now and there are so many Scripture references that the Power Lookup is "clogged" with them and it's hard to find the footnotes. However there are times when I imagine having those references there would be good.
If at all possible, please have Scripture references as optional on the Power Lookup.