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To add to TDDude's comments, the knees parallel will also enable you to make your transitions between targets faster. Many shooters use their upper body as a turret moving at the waist and/or above from the shoulders in transitioning from target to target. This often results in over travel and misalignment of your sight picture with the target, wasting precious time coming back on target with your sights. Drive the movement with your legs/knees and you will find it easy to transition from one target to the next without under/over travel. These split seconds add up.

I also spread my feet out a little wider than my shoulders for a couple of reasons: 1) a little more stablilty, and 2) depending upon how many targets presented I can align my body position better to make those transitions from left to right or vice verser without shifting my feet. Once again, driving the movement between the targets with my legs/knees without affecting my upper body position (grip, sight alignment, etc).

Some some tips I picked up along the way from the pros. If you ever get a chance, take some competitve pistol courses from Max Michel, Ben Stoeger, Bob Vogel, etc. Well worth the time and cost.