Let's be honest, many new players send messages with double signatures until someone corrects them. I did this myself, and see it happen all the time. I think the process of being corrected about something so minor is a little embarrassing and a little annoying. Could it be made obvious somewhere in the new player documentation that they don't actually need to sign messages? I know this is a small thing, but I think the fix is simple, and streamlining something like this removes one more minor annoyance from new people who join. Maybe even just updating the battlemaster basics and new player guide wiki pages would do the trick, or at least minimize the occurrences.