You probably know that you can choose keyboard shortcuts for Mission Control and Dashboard in the Mission Control pane of System Preferences. But the shortcuts listed there are limited. For example, for Mission Control you can choose function keys from F1 to F13, but you can’t select, say, F14 or F15; you have a few other options, such as the right or left Shift or Control keys. The same is the case for Dashboard, though it is limited to only the F keys.
channui figured out a way to enter other keyboard shortcuts for these features. Just go to the Keyboard pane in System Preferences. In the Keyboard Shortcuts tab, select Mission Control or Dashboard and enter your keyboard shortcut there. It will automatically be reflected in the Mission Control preference pane. You can use this same procedure to set keyboard shortcuts for many other system features, such as Launchpad, the Dock (hiding and displaying), and so on.