I think in future games the vamps shouldn't be restricted to whothey kill at any point, but they shouldn't be able to kill three villagers in one night early on. Also, the 'don't post/vote and die' rule should be in place from day one.
They definately should be restricted on night 1, otherwise you lose 1,2 or 3 of the best players in one night and it makes it so difficult to come back from that. Although yeah the don't post and die rule should always be in place. For everybody, including the roles and the mafia/vamps/wolves.
The other rule that works very well is to restrict all discussion of the game to the thread, if there's any evidence that anyone is contacting each other, other than just contacting the gamemaster outside of the thread they shouild be godkilled. That means that if anyone is seered the only way you can tell them about it is in the thread so it puts yourself at risk to divulge the information. It also leads to everyone having a better chance at finding out who is more suspicious due to their posting style as they have to post and what not.
Either way this was a really fun game and thanks for running it Sykes!