Been thinking about rolling my NPCs/Monsters this way too. I would have to come up with some racial templates for bonuses.
Also here is a LINK to the SRD d20 bag. You can roll your stats and then copy and paste the roll history. Like this:
3d6+0
4,6,6+0 = 16
3d6+0
1,4,6+0 = 11
3d6+0
3,4,1+0...