yeh the mod currently works like that, the only real off switch on it uploading is not having the mod on or me removing your upload folder so it has no where to store the uploaded image.
I might still look into a way of making it only upload the screenshot if you are on kraftzone server.. or more fancy put an option to enable/disable it on the website..
eerf is much that could be done to improve just not got around to it.
remove the mod if you think you will forget, as that's how it works currently.