In general, MG's are quite heavy relative to the impact moment of the bullet so would be expected to have less recoil than rifles using a similar bullet, and the entire idea of a bipod, tripod, or fixed mount is to dampen the recoil even further. They are supposed to be accurate if aimed (for example, suppressing a bunker by aiming at the openings, suppressing a tank by firing at viewports and periscopes), even though they can and are often used as area effect weapons by moving the barrel around. There are real-world examples of MG's being used for sniping (when firing single shots only, mind you), so I don't see what's the point of making them more inaccurate.
PR's idea of random spread is a game mechanic to prolong firefights (and partially to simulate suppression under fire, although that logic goes out of the window when the ambushers suffer from it to begin with), it has nothing to do with realism.