Why only one kill per night? Seems odd, is there a reason?
Balance. The village has one kill each day with the vote, and that vote is supposed to be important.
To give team evil more hunting powers makes the night game and people with special roles a lot more important when it's already difficult enough to make the plain villagers feel like they have influence on how the game progresses.
Instead, we have the power of the TIE to (partially) make up for that potential lack of carnage.
But yeah, it's another way to kill players at night.
The hunter doesn't really count though since hunters have only 1 shot.
Usually not, although we have experimented with that at times. The experience has generally been bad though since they tend to flock to the side that is getting the upper hand and that way make the game less tense and exciting.
It's always a good idea to avoid powers / traits / roles that encourage people to help the winning team get stronger. A good game is close and exciting, with either side being on the verge of victory until the very end.
I depends. If you are a hunter you can always shoot him instead. I did that once...
You're not a veteran at this game unless you've accidentally shot/outed/killed your own scanner/team at least once
It creates more intrigue, each baddie group gets to feel like they are playing as opposed to the last one to get in there PM, balances game easily.
The hunt is not decided by who is the last team to send in a PM. There's a specific hunt order, usually with the packs alternating nights.
Once a pack is eliminated the order changes, and the remaining packs get more hunts. This encourages the packs to try to wipe each other out.
As for balance .. I don't think that is really balanced. If the evildoers somehow make contact with each other and manage to start exchanging information they can wipe out team good really really quickly, which means that you get this tipping point which helps the side that is the closest to winning.
I have never played with a setup like that though, so I might be wrong about that.
Follow up question. Unless I missed it there are no watcher/trackers roles/traits.
What are those?
Also while I'm on it what is the difference between roles and traits?
A role determines what side you are on. You always have 1, and only 1 role.
A trait is an ability, something you have and can use to help you win the game. Traits however have nothing to do with what side you are on. If something is a trait, both evil and good people can have it (unless otherwise specified) and it can be tacked on to any role.
It is quite possible to have multiple traits at once.