Thanks! Will fix!

I'd go for the "no area" area system :)

"but if it shows up wall in the maps as a twoparttime deadends with turning circles for delivary lorries, cars and vans ok."

Tagging for the renderer is uncool. Please don't worry about how it shows up in the maps if you're having to draw something that doesn't reflect reality. Could you have used some better tagging on existing ways, for example?