ToME: the Tales of Maj'Eyal

Curious if it buffs shield accuracy?

Yes, it should. It changes your character's accuracy, not the weapon's.

Thank you. That's what I suspected, just needed a little affirmation before I went dumping points into it.

You can always check your accuracy via the character sheet, put one or two points in the talent in question, then check your character sheet again, in order to determine if it has the effect you desire.