IMO, mentors should be allowed to discuss absolutely all aspects of Mafia, including contextual tactics and big strategy
I also think that all mentor-mentee discussion should be had in the actual game thread instead of via PM or private chat, but that's just me.
I mean, for me it's more interesting when the other players can blow up mentors for apparently bad advice. Way more interesting when the mentors have to navigate how to answer newbies' questions without giving away their mentees' Roles
Basically, I want mentors to be like lawyers for the newbies, complete with telling their clients to shut up, complete with lots of nervous sweating and guilty consciences
If I ever host a game, this is the way it will be for mentors