Chestshop has a built in admin shop feature and a sell stack feature (shift click), which is superior to the current sign shop signs. The current system makes players spend 10 minutes selling an inventory full of goods, but if the signs were swapped out, it would take much less time for players to sell their loot. The name of the admin shop can be changed in the config files, but the default is "AdminShop". To set one up instead of putting a players name, you type the configured admin shop name.