I've done this to a few afk'ers in AV along with EotS.
What you do is:
/w the botter..lets say his name is Timmy.
/w Timmy : Hey Timmy! *press space bar till you lose all what you typed*
Then type:
GM<whatevernameuwant> says : Hello Timmy, we have had many reports of you not fighting in a battleground. These reports have led us to believe you are using a 3rd party program. Please park your character in a safe place and be prepared to be disconnected.
^..soemthing like that.
Ive had so far 6 people leave av after typing a GM msg. to them.