I meant to post this a while back, but better late than never I guess.
One of my bugbears with L3 was that if you wanted to activate functionality that took the active reference from e.g. a Bible verse, and you wanted to specify the verse to be used, you had to scroll that verse to the top of the Bible resource window to make it the active reference.
Not so with L4. Now you just click on any verse currently in view, and it becomes the active reference.
e.g. to use Compare Versions (F7) you ony have to click once on the verse of interest, regardless of its position in the resource window, and then press F7. That one click makes it the active reference - no more irritating scrolling!
A really nice little workflow improvement - thanks Logos.