I think it would be convenient if whatever you write on a sign stayed on the sign until you decide to erase it. Even if you knock the sign down and pick it up it will still have whatever writing it had once you place it down again. I like labeling things in my world so as to guide people and I often move them around a lot without changing what's written. Also, what if you could make a template for what you want your signs to say and then craft multiple signs saying the same thing?
Small suggestion for signs.