Currency and economy :D

Sounds nice, good idea! Only thing you can't do this way is something like master-keys, but I guess that doesn't matter.

Lockable doors anyway only make sense in combination with a lua script for example. Otherwise you could simply destroy a locked door, or dig a hole through the wall next to it^^

ok thats true. Maybe the check methode to proof if a key unlocks the door must be a bit better. A master key needs a generates key with a special format the it can open doors witch a vertain area of numbers.

That brings me some good point: Since master keys are freaking expensive in real world...you should do the same here
By the way...keycards (like in hotels) are compareable to keys...just another mesh...so maybe a good idea to implement them also (shouldn`t be that much work).

We will think about a way how to implement something like master keys But lockable doors don't have a very high priority anyway, so it takes some more time.
But yes, keycards should be no problem, so when we introduce keys, we will also introduce keycards

But to have locked doors Dev would have to turn off ( or give Server owners the means to) F2 flying/ no clip. If the Dev could come up with a way to fly with no clip that would be great... Wings maybe ??