actully you do need the stand offs that came with the case the mobo will more than likly short out if it comes into direct contact with the case. they are small usually hex stand offs that the mobo screws ,screw into do not screw board directly to case.
Yeah I installed these:http://www.cybergooch.com/tutorials/images/buildsystem/IMG_6805.jpg
I just didnt know if I needed a non metallic washer between the screw and the riser like I have done in the past. But seems to work just fine without the washer. The case never came with a washer, so I assume it wasnt needed.