*blink* Errr. Sniper Rifle?
Oi vey.
ANyway, I'll have to look those rules over, as I'm not familiar with them. Quick n' Dirty answer without perusing is that anytime it says "GMs Call", assume no, though since it's not covered in the FAQ (and it's not clearly marked as Optional), it really is up to individual GMs. So you can say yes if you want, but the player should note this is a GM call and if he plays with other GMs, he should bring it up and ask their permission.
(I need to make that a blanket rule, actually, just so it's clearer)
Bull