I've nothing to hide - so for me there's no problem in having my work supervised by you ;-)

Believe me - I allways take a look in the wiki, before I start mapping. In this case the documentation was a bit conflicting - the wiki about tag "highway=crossing" says crossings have to be a "node" and the wiki about the key "crossing" says it can be a "node" and/or "way"...
So my initial decision was to chosoe ways, to show the dimensions...
I've just changed that - so now all zebracrossings on mainstreet of Punta Mujeres are nodes and descriped precisely. :-)

See: 
https://www.openstreetmap.org/changeset/132794005 