It's great to be able to press "Shift" to keep the Instant Details displayed regardless of the cursor movement.
However, it'd be fantastic if once the mouse pointer is within the bounds of the Instant Details pane, that you could then release the Shift key and have those Instant Details remain intact.
Then you would be able to do a number of useful things:
a) scroll to see additional content (if the current zoom doesn't allow you to see it all)
highlight a word and perform extra functions