How about a highlight for locked footprints?
In many cases, I like to lock footprints to keep from moving while moving a group. Knowing which prints are locked and not is a tedius task to say the least. It would be super slick to hit a button and see all the locked prints highlight in some fashion, rather than having to click and remember each and every one. If in the same, it may be a simple thing as well to have a highlight mode AND be able to left click, select/deselect the footprints while in that mode.