Actually there's evidence of a horrific Sharran ritual in grymforge and Shadowheart expresses nothing resembling remorse or unease. If my memory is correct she has an ambient chatter basically challenging us to speak out against it. So yeah, I think she's all aboard the Shar train even if she's not all for rampant slaughter. The sense I get from what I've read is that Sharrans aren't generally for rampant, chaotic cruelty and murder anyway. They kill for reasons beyond enjoyment, typically targetted. Their bag is more about corruption and tyrannical control, so there's nothing that would stop them from being uneasy about wholesale slaughter for the sake of slaughter.
