Provide a means to call methods/beans/objects from a routingSlip in addition to endpoints

It'd be nice if the routingSlip wasn't restricted to just endpoints, for example what about being able to specify functions like convertBodyTo() or specify a processor, type converter in the header for the routing slip to call on, for example:

from("direct:a")
     .setHeader("routingSlip", "convertBodyTo:java.lang.String#processor:myProcessor")
     .routingSlip("routingSlip", "#");

Rather than:

from("direct:a")
     .setHeader("routingSlip", "direct:convertBodyTo#direct:someProcessor")
     .routingSlip("routingSlip", "#");

from("direct:convertBodyTo")
     .convertBodyTo(java.lang.String);

from("direct:someBean")
     .process(new MyProcessor());

this would allow folks to have really dynamic routes if desired without having to potentially create/manage lots of little routes using direct/seda/vm.