By now, you may have heard about the rather cool Gunner, IG-88 B and IG-88 D (crew) interaction that was discovered recently. As a result of reading that batrep, I found out something that has always been in the rules, but I'd never really realised - range bonuses are optional. That leads me to the question: When do I decide I want to roll it?
The only time that you might want to roll fewer than the maximum evade dice that I can think of is when trying to take exactly one damage, and prevent gunner style attacks from triggering. So, if I am at range three, and being shot at with a primary weapon, can I roll my standard agility dice, see what I roll, then choose whether or not to roll the extra die?
My gut says yes, and that approach seems like the simplest given the other rules around rolling dice. Given that you can roll more dice up to your agility if you accidentally roll too few, there would seem to be no meaningful difference between accidentally forgetting your range bonus and choosing not to use it until you declare one way or the other, so I guess the real question is: When, if ever, do you have to declare how many dice you're rolling?