One of the big tragedies of 10.7 and later was breaking Exposé. There is now literally no way to use the full display to show all windows on the current desktop! The very most core functionality of Exposé was mysteriously removed.
Any chance you might be interested in remedying that? Given the number of people who are still running 10.6, I can’t be the only person who would happily pay a lot of money to restore this functionality.