How to smooth scroll a Spark List using the mouse wheel

I've got my Spark List smooth scrolling nicely if I grab the scrollbar thumb and drag it. But when using the mouse wheel, it's jumping itemrenderer by itemrenderer.
Is there any way to get this to smooth scroll?  I'm using a List with variableRowHeight = true.
Thanks.

This thread demonstrates how to customize mouse wheel scrolling:
http://forums.adobe.com/message/2783736
An enhancement was recently added that will allow for customizing the behavior without needing to subclass.  See this bug for the details:
http://bugs.adobe.com/jira/browse/SDK-26432

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