Sorry my bad english, im from Argentina and I’m in love with your engine. I bring some suggestions for you.
House and Furnitures (Store furnis) system.
A simple house map with attribute of house and owner, co-owner where you can buying some furnitures with a button. A house map like this video:
Maybe with this system the players can make a house/castle for guilds members
Thanks a lot for help us, and read my message, sorry my bad eng. I love you dude, keep it.
Ninja edit: uhmmm, I have other suggestion more, a merchant system like this (Sure only if it is possible :P):
Maybe with the visual effect of the table with the objects for sale, it would look great.