Deathball Activation question

Hello all,

I'm new to One Page Rules (I discovered this place because of Jeremy over at Black Magic Craft).
I love the simplification of that other sports ball board game, but I have one question.
Under Activation it says: "The player picks one model that hasn’t activated yet and rolls 1, 2 or 3 dice, trying to score 4+."
How does the player decide how many dice to roll?
I'm sure I'm missing it somewhere, and sorry for wasting  time if this is so.

Also, any interest in doing a modern or future type overlay to these rules?

Thanks,


Lucky Felix