I am happy to tell you that there is already feature in place for this, the "Report AFK" feature that you can find by right clicking on another players portrait in Battlegrounds also serves to report botters to us as well :) We understand that it does not say this exactly, but it can still be used to report botters in your Battlegrounds.
That's grand, but still
1) requires multiple people to press that button. Get enough bots in a game and this isn't even a possibility
2) requires the bots to not get into any PvP whatsoever. Essentially, this is asking the other side to not engage any bots, as this will clear any "AFK report" issued thus far.
Blizzard might well state that they care about the customers not running into Bots (and I believe this), but it should be clear (if only from looking at these forums) that the players are starting to lose faith. Botting appears to be rampant enough to seriously impact the enjoyment people get from Battlegrounds, which can not possibly be the intention by Blizzard.
Players are now asking for Blizzard to become more pro-active, rather than reactive and waiting for reports. Direct your attention to the playing fields and focus on purging those.
Whilst not necessarily desired as such
, several other well-known MMORPGs had global system announcements when Bots were deleted and perma-banned. This gave their community both a clear indication that action -was- being taken and at the same time served as a warning for those who considered turning to Botting.
The point I'm trying to make here is that, by keeping it away from the players, there's both a lack of impending doom felt by would-be-Botters and a lack of a sense of retribution by the legit player base.