Those ideas have been mentioned before, and those roles exist out there , outside of EpicMafia so it is worth a shot to just suggest them again.
First, i would like to suggest a particular role that is found anywhere but in here : The Paranoid Gun Ownder.
We already have granny, but seriously, that role is overpowered. Can't die ? Check. Kills everyone tha visits all the time? Check.
So If you ever heard of Paranoid Gun Owner , PGO for short, you will know how much more balanced that role is. Hell, even Town of Salem has it under the name Veteran.
PGO has one shot abbility that makes him kill all who visit him.
This allows for competitive play, and makes you actually scared for your life rather than "Meh, i am granny >.> Boring. Time to win again on my own...."
The second suggestion is that Lyncher to turn into survivor once his target dies at night. It is pretty much how it works anywhere else. It is actually a great thing. Lyncher is supposed to win on his own, but once his target is gone he can only side with town. . . so why not again trying to win on his own as Survivor?