Hi Mark,
I just did, testing the bicycle route to Kuortti that I mentioned in http://wiki.openstreetmap.org/wiki/Mkgmap/routing/issues#Bad_bicycle_routing a couple of months ago. It still makes the detour. It is most likely an issue with Garmin's routing algorithm, not with the map.
Yes, but at least it didn't obviously break anything. That's good.
Indeed. I should perhaps have stated it more explicitly. On the other hand, routes to central Helsinki are broken ("route calculation error"), with or without the patch, for foot and bicycle but not car. It is probably due to broken map data. I remember a similar issue several months ago. I will save the source files, so that I can investigate if the problem persists with tomorrow's dump. Marko