If I'm not mistaken it's a matter of the developers agreement and the design standard set forth in the iPhone SDK. I'd sooner see them do away with the home screen. It only contains links to that are available in the menu bar at the bottom. The Chess.com app is a work in progress like most iPhone apps. I look forward to seeing how it evolves.
idea for set up game
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how about disabling the home/online/computer/tactics/video buttons at the bottom as to not inadvertently hit them while setting up a game. or how about if you hit the button it saves the board setup and then switches the screen. My buddy an i were just trying to "save" a game and i accidentally hit one of those buttons twice...