I need not stress this more I think... but since webmasters can use Google aswell as any possibe cracker [let hackers remain hackers...] can. If it sounds like a lot of work, well... those guys are still getting paid, and if the cracker has the time, why doesn't the webmaster has the time too?

I, to be part of the creators/maintainers of Google, would not modify the search engine any bit [by removing options from it].

cheers!