[mkgmap-dev] suppress street labels / set name=nil

Hi all, Is there a smart way to have mkgmap explicitly setting an empty name for lines? - when I use [default_name ''] the name is filled with some odd content, in my case "Castle Hill Police"... - when I use [default_name ' '] the name is filled with the expected space, but this causes a black rectangle to appear instead of a label background: the setting on Garmin devices (I am testing on a 60CSx) "Max Zoom: Street Label" doesnt seem to work properly fro some ways: even if set to "off", some street labels are still shown, e.g. steps and cycleways. This clutters up the map, so I want to suppress names for those types of ways. Thanks, Ben