Sloppy lockouts and fighting to press out the bar can place a lot more stress on the rotator cuff. Also, when lifters fight the lockout with the bar in front of them, they tend to hyperextend their lumbar spine like the old press, which caused a lot of back problems. Follow the IWF technical rules and your rear is covered. Do things differently and you open yourself to criticism in the face of an overhead injury, even if the relationship to your rule modifications is minimal.