Accomplishments listed multiple times in the player history can be a sure sign that the commish is simming ahead, then rolling back the sim if things didn't go his way.
See this thread for some good input on this type of situation.
http://www.400softwarestudios.com/bo...threadid=39247
As a commish in a league where I currently have a first-place team, I can tell you that oftentimes a commish will have a good team just because they are involved with the league on a day-to-day basis and will contribute exports on a regular basis. So just having a good team doesn't mean that person is cheating - make sure you see several of these types of things going on before you come to a conclusion about your commish.