As I understand it, the garmin format has only a single unpaved bit. So the mkgmap style basically has to map all surface types to either paved (no tags) or unpaved (mkgmap:unpaved=1).
Another approach is to set speeds on roads that you wish to avoid, using the speed as a weight. I am curious what you actually want. Assume an area with a 50 km/h speed limit. Then on a paved street one can go 50. What speeds would you set for cobblestone/sett and dirt so that the min-time route would be the behavior you desire and why? I am not trying to give you a hard time - I have been thinking about how to make routes that people want for a long time, but not done much about it and this is another interesting case.
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