Pickable Iron Doors?

[bvcxzmn]

Chests are easy to protect with plugins because they're just static blocks. Doors can be interacted with using redstone. It would just complicate things a whole lot and create problems.

There was indeed a suggestion about locking normal wooden doors but it wasn't very popular.

Not too difficult, just make it so that when you pic the door red stone stops effecting it and it changes positions, no matter where it started. So if someone decides they want to pic a door in x position, the door will change to y position no matter the environment it is in (x and y would be relative to each other, so y would always have the same hinge as x). Therefore, you essentially make the door a static block (or blocks) similar to the chest.