Choose via tool the usual way. Now PCB is ready to act on a left button down event. In comes a scroll wheel event. Now PCB suspends polling the mouse for an instant, and reponding to the new event, changes the value of ViaDrillingHole up a mil for the up button, or down a mil for the down button.
I think what you're asking for is tool-sensitive bindings. Thus, if the via tool is the current tool, you want up and down to do via-specific things,
Yes, that's one way to think of it.
John G
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