Alternatively, attempt to add the spooky functionality without having to replace the blocks

[BlayTheNinth]

Would make it a lot easier to just support all doors, including modded ones. Would also be a huge breaking change, so definitely not before the next Minecraft version.

[BlayTheNinth]

Could do this and leave the spooky door blocks behind for now to make it less of a breaking change, with a config option to disable applying to all blocks.