There is no feature on this currently but can be implemented through custom coding. The theme is not encrypted and so it can be modified according to your requirements. Implementation is just dependent upon your coding skills or you can hire the services of an experienced programmer to do it for you. Appthemes also have certified community partners
http://www.appthemes.com/partners/ that you may contact for customization jobs.
Likewise, this has been requested at the Ideas Exchange page
http://ideas.appthemes.com/jobroller...?orderby=votes of which implementation is dependent upon the number of registered users voting for it.