Adjusting when the _ymouse starts or adjusting the scrolling speed

[calbers]

I was wondering if there is a way to adjust when the onMouseMove starts from the center?

Like having a dead space in the middle of the stage...that doesn't make it scroll? Like 20 pixels above and 20 pixels below center? Or even the height of the thumbnail/2 each way?

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Also wondering if there is a way to adjust the scrolling speed?
Slowing down the speed it scrolls vertically from center?

Thanks!