In Site Studio there are a number of global settings and configuration options that can be set or overridden within your websites settings.php file. 

Global settings options

Show the JSON fields for debugging:

$settings['dx8_json_fields'] = TRUE;    

Allow the API URL field on the account settings page to be editable:

$settings['dx8_editable_api_url'] = TRUE;

Expose a version number field on the account settings page (for development):

$settings['dx8_editable_version_number'] = TRUE;

Don't show the API key field on the account settings page:

$settings['dx8_no_api_keys'] = TRUE;

Don't show the Google API key page:

$settings['dx8_no_google_keys'] = TRUE;

Set the temporary stream wrapper that Site Studio should use:

$settings['coh_temporary_stream_wrapper'] = 'mytemp://';

Set the sync directory that Site studio should use:

$settings['site_studio_sync'] = '../config/sync';

Set the max number of entities to import via sync in the batch process:

$settings['sync_max_entity'] = 10;

Set the max number of entities to rebuild at one time in the rebuild batch process:

$settings['rebuild_max_entity'] = 10;

Global config options

Set Site Studio API key:

$config['cohesion.settings']['api_key'] = 'api-key';

Set Site Studio organization key:

$config['cohesion.settings']['organization_key'] = 'org-key';