No, please. Don't ban shit like that, it will suck the fun out of the game. Just pick someone skillful to be your SK, someone who doesn't mind putting an extra 10 seconds into a post to match persona.
If a Town member talks a specific way, the SK's advantage is being able to copy that and blend in. I assumed that was the entire point of the setup.
Banning COM hunting/claiming, punishable with an instant modkill, will prevent the Town from using it, or detriment them when they lose a player due to stupidity.