You should post this in the suggestions forum, not here...
Anyways...A commish has so many ways of cheating that you're better off just intensely shopping around until you find the right one for you. Sure you could create a log file, but the commish also has control over the website and the web content. You'd have to make the report be an in-game thing I guess?
My gripe with a few commissioners I have played with is free agency. They conduct imports, save the file name as something else (league-test.lg) and roll it a few weeks to see what everyone is offering. Then they can go back to the actual league.lg file and outbid you. I don't know how or what to suggest to Markus to alleviate this problem, but it's one of the biggest anti-cheat improvements they could make. The commissioner is in such a powerful position when bidding against clubs, and I am pretty sure it's been used against me at the very least a few times.
All this being said, I am starting my own league here in about a week.....if you're interested in joining let me know
I don't cheat...and in fact I am making a league file available at the very initial start that will be commissioner-password free so that everyone can sim/trial-runs/whatever to their heart's content. I am also going to provide screenshots of every rule page there is, because I hate that there are so many options now without notice to owners of whats turned on or off.....The days of simply stating "Join a 2010 real-life league...DH rule turned off" simply don't do enough explanation anymore for me to make a judgment call on whether or not to join a league.