Extend FlexForm
Following fields of the plugin configuration may be extended without overriding the complete FlexForm configuration.
Additional Template Layouts
By default this extension provides two different "layouts" available in a drop-down list:
 
            
    If you need other options, you may register them easily using following code:
$GLOBALS['TYPO3_CONF_VARS']['EXT']['file_list']['templateLayouts'][] = [
    'my label',
    'my value'
];        
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You can then access the variable in your template with
{settings.templateLayout} and use it for a condition or whatever.