Hey guys
I managed to modify the lenght of seasons games from 29 to 82.Actually, you can use the saves of Paulisu and as he explained put them into your save folder.
After that you need to download this trainer >
http://nba-2k.com/nba-2k11-the-most-powerful-trainer/When you're done with the download, launch NBA 2K11, then go back to your desktop and launch the trainer.
After that, go again on NBA 2K11 and load the MP save you want (for example Kevin Durant).
When the save is loaded, go back again to your desktop on the trainer window. You see on the top left of the trainer window the "GamePlay Settings". All you just have to do is just click on "Read" (then the settings of the loaded MP save will appear). After that, just configure the settings as you wish and tick the button "Lock" (
this is very important that you tick this button).
When you're done with that, go back on NBA 2K11,
you MUST save the MP save and everything it's done. If you want to check the number of games, you can just go into the "Team Info" and "Calendar". Normally, the season should have 82 games.
Actually, it has worked for me.
Update : I figured out that the only player for whom this method was working is Blake Griffin. I tried with Dwight Howard, Kevin Durant and Derrick Rose but nothing can be done... Sorry guys
Update 2 : I realized that this method will
ONLY work if the first game of the season is scheduled in late October when the season lenght is set to 29 games.