My thoughts -
GA should not reveal.
I assume PMs are allowed for civilians?
The game can be most realistically won when the Golden Nymph forms a coalition of confirmed civilians of >50% of the remaining players. This is the key role. If Golden Nymph finds a mafia, he should let a confirmed civ know through PM in order to keep his identity safe.
Vulture should be used only once the Golden Nymph dies. The other roles are not nearly as important.
Crusader should ideally be used on the Golden Nymph but this can be hard to coordinate. Still, it should only really be used once there is information about a valuable role - most of the roles are of limited use, and using it on a random role is of limited value.
The offensive roles are really mainly a weapon for the mafia. Civs should be averse to using these.