On a Xencelabs remote you can raise the dial sensitivity setting for zoom using a slider in the Xencelabs app. It won't be perfectly smooth, but will be a little less choppy. The smooth animated zoom feature comes from using the Zoom tool (shortcut Z or command/ctrl + Spacebar) and dragging left or right, so I'm not sure if it's possible to make that work with the dial - I would check with Xencelabs. Hope that helps!