Hello Micker,
Thanks you for your suggestions.
Actually, this idea has been raised when we were developing JA Multilingual component, but it has been removed because All components in Joomla work in relationship, if you only enable some component and disable remaining ones, it can be a cause of some unexpected issue then (E.g: wrong link, Modules display incorrectly if has no articles assigned to new language, …).
So we decided to remove this feature from JA Multilingual component, and keep settings as less as possible for user, this ensure that component will be easier to use and will also result is less support queries.