Could you please set this to `false` as default. For installing as less as possible this should not installed by default. I think there are many users out there which may not use this bundle. And as long as this bundle changes their composer.json directly with json_encode a quit big diff will be generated also only one file is added to the composer.json actually (https://github.com/gnugat/GnugatWizardBundle/issues/14).
However after Symfasize will support any vendor bundle integration this bundle will be used automatically.