I was not sure on the legality of noting it.  It is an often used path, but you would be correct in noting it is not a legal footpath.  For us locals, it is a vital shortcut, as without it, the nearest bus stop is a 20-30 min longer trek to 4th and Keystone), but when using it, the nearest bus stop is right there on the other side. However, I totally defer to your lead, as I am new to OpenStreetMap -- Thank you!