Routing dynamic controller with placeholder

I came to this issue because of the language segment, according to Google SEO it's recommended to have this in the URL. I try to negotiate the language if none is defined and reload the page with the evaluated one. So the first segment is always the {local} segment.
Another solution would be to offset the auto-routing like this:

$routes->setAutoRoute(true, 1); \\ second parameter as the offset, first segment is ignored.

Would that be a better solution? Or is there another/better way without defining all routes?