BUMP.
Any solutions to this? It's not a "nanosecond" like the first reply states; you have to hold it down for 2 seconds. Kind of a pain.
I'd like it to go into expose as soon as I click on the application, so it shows all of the app's windows. To get an idea, activate the Dock Expose feature, and click on each application that is running... it immediately shows all the application's active windows. This would be pretty handy!
As of right now, previewing of the app's active windows is much better executed in Windows 7 🙁 (that is, if the program has support for it)
Having said that, I did assign a mouse button to activate expose and then I select an app from the dock.
Just being nit picky 😉