There should be a thing, which is /coop, but one thing! My idea is that you could create a Guild which means your islands is legal to connect to each other, and 500 blocks away from each other. People could connect islands with their guild members. There also should be games and challenges with different guilds, and the winning guild wins items and grass. It's like a new, better version of the /coop option. Only Donors could create Guilds with a name, theme, rules, and ranks like Owner, Co-Owner, Mod, and Member. You could upgrade guild space and guild ranks so you could get the best guild. When there is more than 4 guilds in the islands, the lower ranks, the further the islands are to the owner. The owner is in the middle, and the members are on the outside, surrounding the Owner are the Co-Owners, or what ever you chose!
That's too confusing, it would make chat a lot confusing and island placing. You'd have to configure when people's islands go next to each other because they're a guild, what would happen to the island next to the guild? It's too confusing, no support.
I think this idea has a lot of potential. It just could be simplified and thought-out more. This would be a cool thing, especially on the new server having island leaderboards and stuff.