I wasn't really referencing crosslistings, per se. However, while I'm not a huge of fan of it, I think that people should be free do so if they choose. I don't think it should be our goal to more restrictive than Groundspeak.
Even without waypoint link field, folks could still crosslist caches and, especially, if we were to get rid of the "Nearby caches on" links, it would be harder to know.
Anyway, my original point was about adding the same functionality for Garmin that OCUS, at least, has for GC.com, TerraCaching, Navicache, and GPSgames.