It looks like every time you mouseOver the Scroller you are adding a listener to ENTER_FRAME. Do you ever remove those listeners? If not you might have a bunch of handlers fighting each other.
Yes of course, on rollout I remove the event listener. Even to date the scroll is not smooth
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Does it help if you round the numbers at all?
this.layout.verticalScrollPosition += Math.round((mouseY -86)*0.5);
Thanks Shrongrunden that helped