I think people that spray and pray (although I doubt they have sufficient mindset to actually pray) are likely to shoot fast without aiming, regardless of whether they have a high cap pistol, single stack, revolver or even just a single shot. People without fire discipline (aiming your shots) usually fire indiscriminately in practice and then panic to some degree in real life. It's kind of like buck fever but is a little more complex than that. Realistic training, lots of practice and good mental preparation is the key to resisting the urge to spray and pray.

Good mental preparation is especially important because not everybody handles stress the same way, particularly when it's your life that's on the line. That's just a fact of life, whether you're in combat, in a police shooting incident or a CCW shooting incident. Based on my experience, I would suggest that it's the mental preparation that causes "spray and pray" far more than how many rounds your pistol holds.