I'd be interested in a no PMs game. Although from discussion in the death thread the previous attempts weren't particularly successful?
I think the new rules worked well all around. Inactivity culls are hard to get right but I feel like it's something that needs to be part of the game, if there's nothing which prevents inactivity you potentially end up with a lot of bored/inactive players and it's very easy for the wolves to hide amongst them which I think makes things really difficult for the villagers, and also a boring game. I'm not sure what the ideal solution is but I definitely think there needs to be some penalty to complete inactivity.
The new seer rule helped maintain an element of uncertainty until the Alpha was killed. It does seem in previous games sometimes it has been a waiting game until the seer finds special roles, so I think players had to perhaps make more of a judgement based on posting styles in this one. I don't think there were any instances where a player in thread was 100% confirmed as good until Dual was killed.
I think anonymous accounts might be worth a try again. I think one of the first games I was involved in had them, and I know it's a lot of work, but I think Banjo made the point early in the game where a lot of discussion was based on how people have acted previously, and things can end up centred around players who are proven as good players of the game from the last 10+ years of history, which not everyone playing is aware of.
EDIT: I think the rarity of this games is both a help and a hindrance. It keeps the games feeling really special and fun, but if known good players are targeted early then it probably makes it difficult for those people to enjoy as they never tend to last long. Obviously these games are incredibly difficult to run so I appreciate why they are only once or twice a year, but I think that perhaps lends an argument to using anonymous accounts. Which only increases the workload so perhaps it's a catch-22