Scott,
[update]
We have just released v3.11.0 Beta 1 with axisY labelPadding. Please refer the release blog for more information. Do download the latest version from our download page and let us know your feedback.
Sorry, there is no property to add padding between axis title and labels as of now. However you can achieve this by adding stripLine with transparent label as shown in this JSFiddle.
—
Vishwas R
Team CanvasJS
