Sure, but I don't think that's the right criteria. Any task can be made faster by associating a fixed button with it. But every fixed button has a cost. If you do a ton of "searching" then sure, this is good. My personal usage would be improved with a "go directly to email" button. Most people don't search that much. Or if they do, they do it from a desktop widget (even faster IMHO). I don't think it's an appropriate usage for the very precious physical space on the front panel.