3rd party tile and object support?

I am assuming the themes and objects of the setting will be constantly added. I am wondering if you are considering opening it up to allow 3rd party tile-sets/walls and objects, as they can quickly add 100's of objects in is short time. I can understand the reluctance of 3rd party to introduce non-standard objects possibly making the session unstable.

if this was already asked sorry I couldn't see anything.