1. Yes, all dice in a Burst attack are rolled against a single target. An advanced rule you can add is that "the dice in a Burst attack can be split between several targets that are within 3" of each other."
2. In FEVERPIT, type has no restrictions other than the initiative, really. Nothing's stopping you from making a team of only lights.
3. That is true.
4. That is all flavour text in this game. The Uproar is indeed an earlier name for the Melding, I should get that fixed.
5. There used to be more throwing weapons. Might add some back in a supplement.
Now, the reason for the types, flavour text and morale confusion: This is the first part of the Feverland games I have planned. There is a much bigger thing in the works, and they share a lot of rules and mechanics, while I cut out the bits that didn't feel right for FEVERPIT (which is supposed to be a simple and quick game).
"More accurate at long range" really is that when there are long weapon ranges in the game, but the Feverpit arena is small enough for that not to matter.
If there's anything you'd like to share with me, you can send it to me at "chaoticalignmentgames [at] gmail [dot] com".