lucy24 - 10:07 pm on Apr 19, 2013 (gmt 0)
Are you talking about something like rewriting to a bad-robots page instead of smacking them with an explicit 403? Like the way many people deal with hotlinks, only now we're talking about pages instead?
I don't know if anyone has done exhaustive testing. It probably depends on the robot. And, of course, a rewrite just isn't as emotionally satisfying as an in-your-face 403 ;)