Of course question one would be the kind of question that someone that already has the power to make changes in the sim with nobody knowing would ask.  Now we will all be questioning the results next season, nice work.  I think it is pretty simple though, playing with the line combinations to put their best players on limited ice time would make it very easy for one team to dominate over a season.  It would need to look somewhat normal so you couldn't have your top TPE players all playing less than ten minutes a game but giving them third line minutes would definitely help.  You could also go in and determine whichever tactic for game style is the least competitive and set all teams to that with the exception of yours.  It would give you that edge that you need.  With all of these though, you would need to be just subtle enough that nobody would be able to catch on and ultimately end up just giving your team a statistical edge over a longer season.