The usability of this would be to be drawing a complex shape and while drawing with the line/freehand tool, one could hit shift and use the scrollwheel and be able to zoom closer into where your mouse pointer is at on screen. Try just that and it won't work.
What exactly does it do instead? Centers the zoomed point after zoom? Or does not zoom at all?
Oh BTW, this functionality I just described works great on a scrollwheel, 3-button mouse by clicking (not scrolling-wheel) the middle button and being able to zoom closer/further from what is being drawing.
Yes, this is what I implemented first, and then just copied that code into wheel-zoom. It should work.
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