There is a role one can add that would give an added bonus to the Gs and would spice things up:
Recruiting: Gangesters can recruit 1 civillian any time they want during the game. Recruiting does not apply for the detective or the bodyguard. The lawyer and any other civillian can be recruited and thus become a gangester. Gangesters has to submit 3 names to the narrator. The narrator will make a draw and let gangesters who is the recruiter. The recruiter will be informed also. The players at large will NOT be informed that there has been a recruitment. They have to figure that by themselves.
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The purpose of drawing 3 names is just so they cant draw the BG and D and be told you cant recruit, instantly finding out its the special roles. Hence 3 names means mathetmatically guranteed a recruit without having confirmation of the special role.
The benifite of the above for the Gs is stopping the easily build civilian alliances, that even the lawyer and jailer can be recruited in the middle of the game, or just any vocal civilian (especially an investigated and previously cleared one) who is leading them all, and taking out Gs. Tactically can make the smart choice of recruiting, and seeing the benifites of it (once recruited the dude that got me lynched and was rallying everyone night I died, so next day I could instruct him to lead his loyal followers to destruction

). It would then be up to the civilians to see who's behaviour has changed suddenly, based on how good of an actor or player that is, wont be easy, but generally should be with a change of tone etc. Makes it more interesting (having to analyze every possible target for recruit).