I noticed that when you turn in delivery quests in a group, it doesn't turn it in for your groupmates. This isn't the case with Thomas's quest; turning in corpses turns it in for your group.

Thomas isn't a delivery quest. Its a quest for a party. The reward is already abysmally low; changing it like you suggest would be even worse.

Thomas's quest is a delivery quest in disguise. Secondly, changing it so two people can turn in the bodies separately has no impact on the amount of reward you get. The way I did it with my partner was we piled the corpses up by the portal, then each took two and spoke to Thomas. I spoke to him first, turning in my two corpses, but my groupmate couldn't turn in his. I suggest changing it so all groupmates can turn in theirs separately, or be forewarned OOC that one person should turn in everything.

Delivery quests don't have monsters fight you.

Your method only works with even numbered parties that find even numbers of corpses.

Certain numbered groups cannot divide the corpses evenly, but what relevance does it have to the issue that people cannot turn in the corpses separately? While many delivery quests now allow you to group up and turn your items in (awesome change), this is not the case with Thomas's quest. The problem is that Thomas's quest was not modified along with delivery quests that are sometimes done in groups, such as Blue Mushroom and Fort Mur.

When you turn in corpses for Thomas' quest, it should now collect all of the corpses from everybody in your party.