[eluser]Lockzi[/eluser]
I'm far from an experienced developer but I was going to say split it up... But then I figured it basically depends on how your administration part is going to look like and be used... You might be using the same/similar codes for listing news and such which would kind of be against the DRY (Don't Repeat Yourself) and the MVC logic.
I would say do as you wish, since, from my limited experience, I can't see any problem with either.
Regards,
Lockzi