I have a plan to put them off without the harsh "No" - require anyone proposing X be responsible for documenting X before it's put into 'production', if they wa

I have a plan to put them off without the harsh "No" - require anyone proposing X be responsible for documenting X before it's put into 'production', if they want it that badly that they are willing to do that then I'd have more faith it's something useful and not "oooh the shiny" - worst case at least it's documented.