Is there a possibility that you can specify an item requirement. For example, if I have 20 fish in my inventory, the server gives me a fishing rod. The command to give the fishing rod is easy but the requirement of the 20 fish is what will make this plugin even more robust.
You can allow quests, special areas, access fees, economy trade, be used for sale signs (1 item, server pays you money), and more. You should consider adding item requirements as it will let me and other server owners be able to expand greatly.