-Xacto Knife or another Sharp Blade
-A Small Strong Magnet(mine is about 6mm circular neodymium magnet about .5mm thick. Shape shouldn't matter much just thinner is better)
-Glue or Double sided tape
Where to place the Magnet - Measuring from the Top of the DODOcase 81.2mm(3.2in) down
Carefully slide your blade under the colored portion of the material (the green part on mine) to make an opening centering it at roughly 81.2mm to fit your magnet.
Slide the magnet into the slot you have made and place a small bit of glue on the material to seal it back together (or double sided tape in my case since i couldn't find any glue at the time)
Enjoy your DODOcase more with the auto-sleep function!
http://www.frenergy.com.au/ (one source of fairly cheap magnets online.)
I'm fairly sure a smaller magnet as long as it's strong would work just as well, and this magnet I am using does not touch the glass of the iPad when the case closes so there is no chance of any scratching or leaving a mark of any kind.
In the Images the magnet appears to really stand out but in your hand it is barely noticeable.