I'm sure whatever you decide is rock-solid USR practice!
Viewing post in USR 15th Anniversary Edition comments
Heh! I appreciate the vote of confidence! Years of playing with a (wonderful) min/maxing friend who could squeeze every possible bonus out of the proverbial rock have probably got me overthinking this. I just like to "get it right" or "as intended by the game itself," you know?
Being able to stack applicable Specialisms into a single dice roll does make that particular character (or foe) a juggernaut in certain circumstances.
Then again, if their Specialisms are stacking in a narrow set of circumstances, it likely means that character is very narrowly focused ("You had one job! One!") and - while they shine (or are terrifying) in that one type of situation - they're less capable in other activities.
That amazing gunslinger who stacks their selected Specialisms "Quick Draw" and "Dead Eye" in single rolls during a gunfight is going to be an absolute terror, but quite less impressive when trying to bluff at poker or sweet talk the saloon girl, having put all their Specialisms in one basket, so to speak.
So I guess I've talked myself into allowing multiple Specialisms in a single roll - but is that the "right" call? Cheers!