I figured out a way to move the "inbox only" view pretty easily.
In Messages, click the wheel and select "search." Scroll down to "Folder:" and select the inbox. After that, change the "Show:" option, if you like. I don't want to see the Sent messages, so I choose "Received Only." Now, click the wheel again and select "save." Give your search a name, then scroll down to give it a shortcut key. I named mine "My Inbox" and gave it a shortcut of Alt+m.
To see the saved searches that come on the BB, from the Search screen, click the wheel and "recall."