If you have a page especially prepared to hold the full info and the NewsView control on this page is set to use Details mode you should event not see the "All news" back button. The control you have dropped on the destination page uses Auto mode and this is why you see the link. the property SingleItemUrl
is supposed to show an item in single mode only which means that the control should be configured to use Details mode.
There is way that you can expose a custom property which alters the back link depending on your page. The easiest way is mapping the external template for details mode - ListPageDetail.ascx and hardcoding the back link. The better option is creating a custom control that inherits from NewsView and then overriding CreateSingleContent() from where you could access the back url. Basically you could hide the default button and your custom HyperLink where you set NavigateUrl property. You will be able to access your custom link from SingleContainer of the template.
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