Jeff, it would be nice to be able to identify not only an application by its windows class but optionally by its components (contained classes) too. Let's say, in the Add Application windows there could be a a checkbox that would tell the finder tool to get any class or only that of the top level of an application.
This way we could use the same gesture in the same application to do different things depending on where - over which object of a certain class - it was triggered.