routeContext features

Hi,

I really like the feature of <routeContext>, but I think some features are
missing. Maybe someone could point me to the right direction.

- routeContext must not be empty
I would like to give users (other developers) the possibility to extend/add
their own routes. But currently the routeContext must be filled with at least
one dummy route.

- routeBuilder (ref) not supported
There is no way to use routeBuilder ref for Java DSL routes. Here is the
fallback to use camel vm component, but it would be much nicer if I could use
the same syntax as in camelContext.

- routeContextRef not supported
Extension of other users (developers) in XML can get quite fast very large.
Currently there is no way to externalize those routes :(

Please let me know your thoughts how to either make use of current available
components/features to accommodate the above needs.

Best regards,