title: Changing zoom in D3.js from mousewheel to control+mousewheel
body: <p>From <a href="https://stackoverflow.com/questions/13713528/how-to-disable-pan-for-d3-behavior-zoom">this question</a> I know how to disable mousewheel zoom in D3.js. How can I remap it to holding control button down plus mousewheel? Thanks.</p>