[OSM-newbies] Stepping stones?

[ael]

I have just mapped a place where substantial blocks have been laid in a 
river to form stepping stones. For the moment, I have tagged this as 
highway=ford. I found that on the wiki, but not stepping_stones.

I was using josm, and it did not offer highway=ford among its presets 
unless it is well hidden.

I don't feel comfortable with "ford": no sort of vehicle could cross. 
Even a bicycle would present great problems. I suppose that I could 
qualify with things like bicycle=no. It probably needs "water=low" as 
well :-)

How else should I tag this crossing place?

ael