advanced targeting computer and accuracy corrector are good examples of dice results regardless of dice (though they are not uncancelable)
Abilities such as Xizor's deals in uncanceled hit/crit results, so we already have a precedent there (not that we necessarily need one given it is a new ability)
the way Bossk will work is that one of the crit results that are not canceled by the defender will be eligible for his ability, regardless of how many other dice are in the pool. If you roll incredibly well (or heavily modified) against a ship that can't cancel dice well (low agility, no evade etc) you will be able to have more hit results than you have dice (provided you score an uncanceled crit)
Edited by ficklegreendice