i'm after something easily deserializable without adding more parser. eg:

````
cake settings.settings write -t "Asset Timestamping" -d "Asset Timestamping" -i radio -e -p 'tab=admin_tab_setting^Moptions={"false": "Disabled", "true": "Enable in development mode", "force": "Always enabled"}' Site.assetTimestamp "force"
````

From command above:
2 keys: `tab` and `options`
where `options` is an JSON 'array'.

Similar code was also used for 'checkbox'.