Would it be possible to add a NG+ category to each of the island runs like Kronos, Ares, and all the other islands?

While this is a good idea, we think it will just clutter the leaderboards too much. Island runs are already relatively inactive so we don't have a need for it, though if enough people are interested in actually submitting to them we can reconsider it.

Would it be easier to just allow NG+ runs on the same leaderboard?