I don't know how other addons provide the Wheel feature but something I am sure, it is not standard.
From the file SecureTemplates.xml :
Code:
<!-- A variant of SecureActionButtonTemplate used for unit buttons -->
<Button name="SecureUnitButtonTemplate" inherits="SecureFrameTemplate" virtual="true">
<Scripts>
<OnClick function="SecureUnitButton_OnClick"/>
</Scripts>
</Button>
There is no OnMouseWheel script.
Sorry, I have fixed a issue with button click 10 to 15 in github.