I use an utility called ClickMonitorDDC http://clickmonitorddc.bplaced.net/ that allow me to hover over taskbar icons that it put and use my mousewheel to change the volume and brightness of my monitors. The icons appears in the displayfusion multi-monitor taskbar but the ability to change change the volume/brightness with the mousewheel by hovering over the icons is not possible in he DisplayFusion taskbar.

Is there a workaround or could that be added in future versions?

Great, hopeful to see this in the next version.

Still doesn't work.

Windows does not support mousewheel over icons,
Windows only generates messages for left or right clicking icons or moving over icons,
but there are no messages for using mouse-wheel over icons,
therefore only way to detect mousewheel over an icon is to implement a mouse-hook,
in this hook every incoming mouse-wheel is checked if it happend over the icon,
but this is some kind of hack, and normally only the original icon can be identified (for instance by Shell_NotifyIconGetRect).
Using mousewheel over icon in primary monitor should always work, but mousewheel over duplicated icons on secondary screen will normally fail,
I think DisplayFusion can do nothing here, the problem are missing windows-messages.
Volumouse seems to have the same problem.

any progress on this?