it's definately not worth it
the hack just overwrites the pf one time with zeros...this does absolutely nothing...oh, I'm sorry, it slows you down, that's something
anyone that can gain access to your pf, and read or copy it, will surely be able to image a simple overwrite of zeros.
in order for you to have security, a file needs to be overwritten fully 9 times, with random information...less then that...nothing is much usefull