When I was looking at the shop inventory for the Craft Hall, I noticed a few items that had mismatched icons and names. The tooltip for the item matched the icon (so if the icon was a pistol, but the item name was "Fine Club", the tooltip was the tooltip for a pistol).
This didn't happen when I reloaded a save, so I'm not sure my save file would help.
Screenshot: http://vampirecoffee.net/POE/mislabeled-craft-hall.jpg
I suppose you could use an arquebus as a flail, but I'm not sure it would be very successful.