I'd like to voice my support for an option to have the Goblins not launch the attack by not joining it, but also discretely eliminating one or more of their leaders. Ideally, this would mean that the whole camp doesn't magically know what that shadow was that
killed Dror. And then you can just leave Minthara alive, or have her
knocked out, kind of like how you can with the Dark Urge
and Alfira, which then prompts Quill to show up. Additionally, there's no reason you can't kill the whole camp, save for the leaders, you'd just knock them out, and then see them again later, or maybe just Minthara as she already has stuff later in the game.
. Honestly the knock out feature is really nice, and I wish it did allow for more things like that.