I am seeing some inconsistencies when using this setting with a TimeChart in IE11.
Sometimes the first few clicks do not seem to work, and the scroll wheel still only handles the page scroll.
Also in Chrome and FF you seem to be able to click to the left of the left axis to enable the scroll wheel to start zooming. On IE 11 even when I can get it to start zooming, I usually have to be clicking directly on a bar. This doesn't work as well for us since we have onclick handlers on the bars which make you navigate away.
I was just wondering if you are noticing any of these things? I was able to reproduce them on your demo pages by adding the appropriate settings.