I'd like to suggest that the ignore function will block /roll.
Example:
Today in AB we once again had a player spam /roll the whole BG, and the ignore function doesn't help. I've covered parts of the players name in case it's considered "naming & shaming". The player was on the opposing faction (if that matters):
https://i.imgur.com/LaPwkxO.jpg
https://i.imgur.com/tLkO5bq.jpg
Have a nice day~