As it happens, we are spending some time on flightplan filing ready for the next version and this topic came up. We are discussing adding an option which would preserve town/city names only, in the route field, with an associated warning that the flightplan would no longer be ICAO-compliant.
The Austrian document is interesting. It specifically states that it applies to flightplans filed WITHIN Austria, but most people file flightplans in order to facilitate a journey from one country to another. Are you asking for this option for flights within Austria, or for international flights?