Is there a way to enable Rating Button Feature on the Canon EOS 5D Mark II?

[Alipacman]

Hey guys,

I'm a computer scientist and absolutely new to this whole area, since I do not even own a camera. I'm just here for my girlfriend because she told me how much she would love to buy a new Canon EOS 5D Mark III camera just because her EOS 5D Mark II misses this 'Rating Button' feature (second button on the top left [1]). Therefore, I thought there might be a hack for it, since it is only a software limitation.
Is there a way to activate this 'Rating Button' feature on her camera?

Thank you for your help 

[1] https://imageservice.asgoodasnew.com/1000/https://imageservice.asgoodasnew.com/1024/9946/1/title-0002.jpg