Hi Tom,
Thanks for having a look at my changeset. Now I've been reminded about it, and have had a look at the wiki again, I am not sure whether intermittent=yes is appropriate here, as that seems to be a tag more used on rivers, maybe flood_prone=yes would be better (as the stepping stones are impassable after heavy rain in winter). Also does the node need to exist, as the stepping stones are marked on the way too? 
Cheers