personally i have two gestures, one is the normal nade throw with no announcement, after all if there are no friendlies ahead of you, they don't need to know its coming and negates their chance of using a dodgeroller ect to get out of the way , and my other one is for throwing nades with friendlies near, it calls out "Frag" and has a 2 second delay so the friendlies around know to get out of the way and gives me an extra second to aim the nade before I throw it out