|Copied from my comments in the RatingBuster page:
I have one feature request. Is it possible to implement an option to include block rating in the calculation of an item's total avoidance? My main is a protection specced paladin, and block rating plays a large role in the reaching of 102.4% avoidance. It would help greatly in the comparison of items like the Vindicator's Hauberk(http://www.wowhead.com/?item=29127) and the Jade-Skull Breastplate (http://www.wowhead.com/?item=28262). Under the current system, the JSB's block rating is not factored into the avoidance, and Rating Buster says that the VH will result in a nearly 2% increase to my avoidance. However, this was not the case. I tested my avoidance wearing both pieces, and the Jade Skull's was ultimately higher due to the block rating (admittedly, only by about .5%).
Please, correct me if I am wrong in any of these calculations. I don't claim to be a great TheoryCrafter at all