hey, i think if you create a super route, you're still meant to keep all the tags on the original routes. otherwise it breaks lots of apps that don't understand superroutes. 

Since this is more of a network than a mega-route, I think the usual approach is to use a tag like https://wiki.osm.org/Key:cycle_network (see http://taginfo.geofabrik.de/australia-oceania/new-zealand/keys/cycle_network#values for some examples)

what do you think?