Ditto routes. Apparently.
I avoided using the SD card until very recently - so I wasn't aware of this. Thanks.
With the SD card route selected in BC, you can load the route, show the dialog box and change names and via and shaping, and and delete points. Without disconnecting the USB cable, you can view the gpx file and see that it has changed.
Of course, you have to import the route into the XT once the XT is restarted, so it is possible to get 2 different versions with the same name. I'm trying to decide how useful this is.
But one thing springs to mind. It means you can edit the route in BC and see immediately the effect of the edit in the GPX file.
I think @FrankB's investigation int subclasses may find this useful - unless subclasses are only set after import.