TYPO3 Core

It would be nice to have a Environment Switch in the LocalConfiguration.
Something like in Flow would be awesome.

In the Vhost Configuration:

<VirtualHost *:80>
        ...
        SetEnv TYPO_CMS_CONTEXT Development
</VirtualHost>

Which automatic uses the Development key of the array:

return array(
    'Production' => array(
        'BE' => array(
        ),
        'DB' => array(
        ),
        'EXT' => array(

        ),
        'GFX' => array(

        ),
        'SYS' => array(
        )
    ),

    'Development' => array(
        'BE' => array(
        ),
        'DB' => array(
        ),
        'EXT' => array(

        ),
        'GFX' => array(

        ),
        'SYS' => array(
        )
    )
);