Andy,
At this time, Switch Executive does not have support for creating
routes that span channels with different wire modes. As a work around,
you could create routes for individual legs of a route that have
uniform wire mode, and then group them into route groups. This way you
will lose some of the auto-routing otherwise available to you when you
have uniform wire mode, but you will still have the flexibility of
having named routes in your application.
I hope this helps,
-Serge