This is a relatively simple suggestion. When you /lock your island, absolutely no one can visit your island unless they're in your coop, please add a command that allows certain individuals to /visit your island without the owner having to /unlock it, e.g. /add TheChainPickAxe , or some other command that isn't currently being used. Ideally the above would suit best, but giving people who are trusted to your island the permissions to visit it when it is locked would also work.
Support maybe like if they add the friends' plugin like they did in org maybe allow access to friends' only visiting your island or certain players
Support, however if it was for all trusted users, then sometimes they can go grief you because your island is unlocked. Nonetheless, if it was so that you could add players individually then sure.
Support for the idea of individually adding players to locked islands, however as Dough said, I don't think people you trust should be automatically allowed on a locked island. If all trusted people were suddenly allowed this, then people who are inactive and have locked islands and don't expect anyone to be allowed on could be suddenly exposed for griefing and looting. People don't always trust players because they actually "trust" them--it could be out of politeness, because they were signing a wall, for a chest trade, etc.
Support, I do like to keep my island locked since it is still a work in progress but I also have some players that want to help build so it would be nice for that command
Neutral-I like the idea of it. The one thing that concerns me is the trusted players and your coop group. If they have access to your locked island, it would increase the probability of people greifing/stealing.
Support, though, as people have said before, the second option could result in group griefing/looting. Full support for the first option, though.
The command itself is not confusing It's just locking your island and just adding to a list /add [player name] Hope this clears things up for you