On Mon, 20 Nov 2017, Vincent Privat wrote:
The color/colour tag is not natively used to colorize ways. You could write your own map paint style to do so, see https://josm.openstreetmap.de/wiki/Styles#CreateStyle
Isn't KML loaded alike to GPX? In this case he simply needs to right click the layer and select a color.
Ciao -- http://www.dstoecker.eu/ (PGP key available)
