Middle Click and Hold?

I'd like for my normal mouse's Middle Click button to trigger Show Desktop for all apps, except for one app, in which I use the middle button to click and drag to pan and orbit in a 3D modeling environment.

Is it possible to do this by setting the Middle Click trigger to the Show Desktop in the All Apps group, and setting up some kind of trigger and action for the specific app I want to not use the middle click in that way?

I tried setting the Middle Mouse Button to "Use Apple Default or Do Nothing", as well as "More Mouse Buttons and Modifiers" with Trigger Down & Up, but neither seem to get the middle mouse button to behave normally in the modeling app. Am I missing something here?