One of the things that I do when I cross the cables (which is the only way I've done it so far) is to use ball-joints on the servo end and put one ball-joint on the top of the servo arm and the other on the bottom. This way, the cables aren't rubbing where they cross. Works great on my Funtana and it looks like it's going to work well on my GP Skybolt (kit, not ARF).

Once you've done it once, you'll see how easy it really is and how well it works.

-Todd