Off topic a bit, but I don't really have time to vote or anything right now, so I'll just put out the suggestion that we should at some point before we leave make it very clear that we don't want any seeds going to Kyubey. I'd personally also take the moment to plant the seeds of suspicion re:Kyubey's motivations - but not enough to lead to a witchbomb.
Something like: "Oh and before I go, I'd like to ask that you don't give any seeds to Kyubey anymore - if you need to stop one from hatching call me instead anytime 24/7 and I'll make sure to be there."
*chorus of why, are you crazy, etc*
"Listen, did any of you know about the truth of the soul-puppet arrangement before you wished? It didn't exactly tell us the fine print, right? I don't trust it half as far as I could kick it. I mean, what does it even do with the seeds, anyway - stop them from hatching? How? If it can do that, why doesn't it just collect them before they hatch and seal them - what does it need us to fight for?
"And where the hell are all these witches coming from, anyway? How do we know it isn't just circulating the seeds around - having us kill one, fill the seed, then taking it somewhere else and releasing it? It certainly didn't mind lying by omission and sending us to fight for our lives - who knows what else it's hiding. We sold our souls to this thing and we don't know shit about it.
"I don't have any answers, but I know that I don't trust it and I know that if it wants something, I want to stop it from getting what it wants. What do you say?"
TL;DR: I want them to not give seeds to QB, or at least be wary enough of it that they keep contact with it to a minimum - no sense letting them relay our actions and words to it when we've gone so far as to talk in timestop to avoid eavesdropping, y'know?