username routing to multiple controllers

Hi. I am trying to route a username to 2 controllers.  I am coding for a shopping site, and what I am trying to do is this:

www.xyz.com/myUsernameA would route to the Users controller 

www.xyz.com/myUsernameB would route to the Shops controller

A client of my site can be either a Shop or a User, and both models share from the same pool of unique usernames (similar to the facebook username model).

Is this possible in cake 2.x? 

Thanks,

Robert

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