Most scroll items I do not sign. I am not a seller but if I did sell my items I would.
For some items that I am giving for a fundraiser, I use coins similar to what Steve sells. (Steve does not ship to Canada so a guy in our club who has a laser does similar coins). These are usually items like sports ribbon racks, bird house etc.
I am a turner and I do sign most of those items with a permanent ultra thin Sharpie marker. I sign the year, type of wood and my name.