With a 9-speed Shimano MTB shadow derailleur (RD-M772 for instance) the cable runs almost exactly straight from the seat stay into the RD fitting. Of course, that's a pretty spendy fix for an aesthetically displeasing cable routing. On the downside, the cable exits directly into the spokes, so you pretty much need to bend it immediately to finish the set up. Oh, and it has no barrel adjuster so you need one inline with road levers.