A lock for the color pallet, but tool specific.
When I need to adjust a filled object and then return to say, the pen tool. I first have to reset the color and stroke before I can go back to my line work. I would love it if there were simply a lock for this on the pallet so that while drawing I can lock it to a certain color, fill, and stroke weight/style. Perhaps a simple lock on the tool pallet under color. Gray out lock icon over color when I turn the pen tool back on would be a good indicator. So it is attached to that tool only, but easily unlocked when finished.