Routing options

[UKenGB]

I usually need to plan a route with 'Avoid Motorway' and 'Avoid Tolls' checked, but sometimes I need to allow these to be used. Usually these settings then apply to the whole route, but the problem is that they might be different for a different route and currently it is an RC overall application preference. Is it not possible to be able to set this for a route and have it saved with the file so that each time it is opened the routing prefs as set for that file/route will be used and so can be different for each file that is opened?

I suspect the generic file formats used make this impossible, but would be good if there way a way to enable this.