With the new changes to Spotlight coming in Yosemite, I think it would be nice to have a more robust Accordance integration. I would love to have the ability to hit "command-SPC" and have the option to do an Accordance search.
On top of basic integration where the search would open up in Accordance, I have no idea how feasible it would be to have Accordance integrated into Spotlight in the same way that Apple's own dictionary is (where the results just appear on the screen). I think it would be phenomenal to have the ability to type in "Matt. 28:18-20" and see it show up as an overlay on top of what I am currently doing.
Just a thought.