Out of curiosity, what is the danger of doing this type of redirect within WP? Why would it be unwise to do a redirect to a specific page, but still safe to do a redirect to the root of a particular site? Is it out of concern that the page being redirected to could easily be deleted?
Thanks!
P.S. If im hosting on WPE, these are the instructions you are suggesting I follow, right? http://wpengine.com/support/redirect/