From a thread I made on it a long time ago:
(Source)Originally Posted by VanerasThis is not something that we are encouraging, but it is also something that we currently have no realistic way to prevent. That being said, this is something that may change soon, which is why we always advise people to not use any type of add-on designed to circumvent or bend our balancing safeguards... using such add-ons can lead to severe account penalties!
This clearly leads to the following question.
Does the use of the Preform AV Enabler addon by many players constitute circumvention of the balancing safeguards in place?
The Battleground queueing system currently supports easy entry into Battlegrounds for groups of players of size five or less. This could possibly be a technological limitation, and as such an unintended limit.
The "balancing safeguards" of Blizzard's queueing system for Battlegrounds is unknown, but, they have said in the past about the LFD system that they try to mix high- and low-geared players together for dungeons. This means that if a similar balancing safeguard is used for the PvP queueing system, premades made up of mostly high-geared players (most premades have a reasonbly high resilience prerequisite to join) could be breaking the rules by attempting to fill a battleground with such a group.
An easy way around this is to have a wide spread of gear levels in your premade, as this would constitute a "balanced" group of players, and premades would still be able to accomplish their goal of farming HKs or getting achievements by the sheer amount of organisation they have over a (highly likely) random opposing team.
Vaneras does say that "this is something they may change soon". Either they are going to ban the addon and attempt to prevent multiple groups from entering the same battleground, or they are going to allow raids to enter battlegrounds. Note that Vaneras said "this is not something we are encouraging" as opposed to "this is something we are discouraging".
Just some thoughts. But, please, be aware. If you believe that Preform AV Enabler is causing an imbalance in battlegrounds, you're liable to be actioned.