Developers... I get that sometimes shipping half completed or experimental features in the code is a fact of life. I get it.
But if its not baked, not fully tested, not ready for prime time, THOU SHALT HIDE THAT UNFINISHED SHIT. Registry key, magic file, don't care.
Nothing looks more ass in the user guide/help than a screenshot and a description of it saying "oh.. yeah this isn't finished yet. Pls don't click on this.". You KNOW what they're gonna do.