Is it possible to turn off this option...or maybe in a future patch make it a check box if you want to have people join you? Ive always been very willing to have people hop in...but un the AvA, being less people, it happens way too much getting a request window in the middle of a fight.
I always tell them its better to text request first...but its always a numbers guy, a new guy, who doesnt know what it does when he requests ,and its one after another.
If nothing else..have a notice that pops up on the join option, that asks him if he used text first...if he says yes, then he can click join.