Thanks to the new metrogold from geodude.nl this had been fixed.
He charges $6 for the program and it mods metroguide to add the routing automatically.
I currently have a 2gb card with us topo, canadian topo, and metroguide north america v7 on it.
I have tested with Euro V8 metroguide which worked as well as some homemade maps I found on the internet - an amazingly detailed carribean, and bermuda, and greece and Japan.
Only the metroguide NA and Europe are routeable the others don't have that kind of data, but they all play nicely together. and thanks to metrogold, there is no 512mb or 1gb memory limit of sendmap. So it will support up to 4gb cards if those ever come out.
I love the fact that when I got my Legend Cx I did not have to buy new maps to autoroute, thanks to metrowizz.
Unfortunately, I cannot get autorouting to work when I have uploaded both Metroguide NA and Topo maps. What I ended up doing was using a nearly free 512MB microSD card for topo then I can swap it out when I want topo maps.