Due to the recent recode the following features are still missing.
Spectator slot. -> This could possibly be enhanced to isntead be a custom row that has two variables [Custom Name] [Custom Limit] which would make it possible to add something like mentors.
Automatic thread discussion
Backup amount (The only reason why I think this is somewhat nice to have is when the signup is used for something not requiring backups, such as a signup that is not for a mafia game (for example my osu! tournament)
Due to the recent recode the following features are still missing.