This is a bit of a quirk of the RAW for opposed checks:
Suppose I have a character who has the Control: Skills upgrade to Farsight, so that she adds her Force dice to her Perception rolls. So let's say normally the character's total Perception pool is YGWWW
An enemy with (let's say) YYG in Stealth is trying to sneak past this character. This leads to an opposed check. Because of the character's YG in Perception skill, the enemy adds RP to his pool for the opposed check. But unless I'm misunderstanding the RAW, those white dice are *only* added to Perception checks! So when someone is trying to sneak past the character, all that Force perception ability just goes away and the white dice are not added.
Seems like this would be a natural place for a house rule: the white dice are added to opposed checks as well, generating failures or threats instead of successes or advantages. Thoughts?