There should be an option for server owners to set a limit on how many people can access a door.
For example on a lower population server a group of 15 would dominate completely. To help counter this he could set “door.limit 5”
This would mean once the fifth person has added unlocked a door with a code, nobody else is able to.
And yes yes I know this doesnt make it impossible for groups of 15 to work together but it does make it harder for them and discourages it, and MOST importantly, it should be optional and set by the owner.
Lets see if we can get the Dev team to take note and comment!