Mike I would recommend lowering the bar faster, this serves two purposes:
1) Expends less energy on the way down.
2) Makes the pause appear more pronounced.
The faster reps will make for considerably less shoulder stress as well. It's a win, win. I wouldn't recommend this for Bodybuilding purposes but for Powerlifting speed is key. Pavel Tsatsouline has written on this extensively and it's worth taking a look at what he says.