This was done in 2k11
Download edit pad pro here
http://www.editpadpro.com/download.html
Open edit pad pro, open ur stadium file s***
At the top click "Seach"
Than click "Toggle Seach Panel" - the 2 search boxes should pop up at the bottom
In the top search box type in
0000803F0000003F0000000000000000
0000000000000000
click ctrl+f3 to start the search
then just click f3 until the search stops and brings u here

u see the 80 3f. thats the only values u need to mess with
see...

now increase and decrease the hex value 80 in small increments to ur liking. for example 81 82 83 or 84. No need to go crazy here.
I dont have the game to make a good tutorial but this should work in ALL Stadiums
Maybe one of the moderators can clean it up