the cmf-sandbox is doing it differently. but as its commented out, changing the configurator is not going to help - it does not edit config.yml or does it?

imho having values configured to `~` (with comment saying you only need for this or that backend) is less confusing than having to activate the config in both config.yml and parameters.yml. but if you think its the way to go, then the change by sosek108 makes sense. we could then change the sandbox as well to become consistent.