Disable auto wake/sleep when opening or closing cover?

[AC Question]

I've bought this flip wallet case, original from Samsung. It has the automatic wake/sleep function. But the cover never lays flush with the screen, it is always a little bit off the screen and therefore the screen alwyas goed on when i ut it on the table. Do you know how to turn this off, so that when I open the cover the screen does not come on untill i press on the button on the side?