Pfui - 7:39 pm on Feb 6, 2012 (gmt 0)
Of course, "tweak to taste" means you allow the ones you want, block the ones you don't. (And a huge, HUGE number of Operas are actually bad bots, btw. Including Mozilla.*Opera versions.)
Why mess with 'safe numbers' theories when an easily implemented solution already exists? Why not simply whitelist?