No, this isn't about necromancers creating undead, though that would probably be relevant to this conversation, too. That is still legal in PFS, isn't it?
In PFS play, I've had situations come up twice now where one of my characters wanted to do something with the bodies of dead, humanoid foes, and either the GM or other players at the table disapproved.
The first time, the PCs protected some peasants on the road from a group of tengu bandits. After killing the bandits, my character suggested cutting the bandits' heads off and putting them on sticks on the side of the road, as a warning to other bandits.
Some of the other players at the table disapproved. As I recall, at least one guy thought I was treating tengu more like animals than humanoids because of their avian nature, so he thought that I saw them as less than human. That's not it at all.
Bear in mind that my character involved in this was lawful neutral, bordering on good at the time. He has since shifted to lawful good (I've got a long, involved back story for this guy, explaining his alignment shifts, among other things). In a "lawless" frontier, this just seemed like an appropriate way to enforce civilized behavior - scare the area's bandits into giving up their evil ways. But the rest of the group didn't want to do that, so I just went along with the majority.
More recently, I played my new tiefling fighter/chef last night. Early in the scenario, we killed some wild animals, and my character made a point of applying his profession (chef) skill towards turning the remains into dinner for the group.
Later, we killed a monstrous humanoid foe (don't want to give away any spoilers, but it's a humanoid race that's not in the Advanced Race Guide). Once again, my character wanted to cook up the body, but the GM insisted that cannibalism is an evil act, so I couldn't do that in PFS without giving up the PC permanently. Since it was just a minor bit of RP on the side, I didn't push the point.
It should be noted that earlier in the scenario, we fought a different group of "probably evil" monstrous humanoids, and my character was the one who wanted to try talking to them first, but the rest of the party charged in swords drawn to just fight and kill them. How is killing enemies without even giving them a chance not evil, but not wanting their remains to go to waste considered evil?
Different societies have different social standards with regards to the remains of their dead, both in the real world and Golarion. If we were talking about the dead bodies of good people, I could see our PCs wanting to treat them with respect, and bring them back to their families for proper burial, cremation, or whatever that society does with them. But if it's someone evil enough that we've already judged them worthy of death, does it really make sense to draw the "evil" line in the sand at doing stuff to their bodies after they're dead?
Since I was planning to make this an ongoing RP quirk for my fighter/chef (he'll cook ANYTHING), I thought I'd ask the question before I play him again. What do the rest of you think? More important, what does campaign management (who I'm sure won't have time to look at this until at least a couple of weeks after GenCon) think?