That means domain redirects that frame the actual site up would be penalised as URL cloaking? This is very strange, since Yahoo's domain registration service actually provides this option to domain users. It is kind of a contradiction if you ban the same tool that you offer to users!
I have no idea pikachu, this is basically their definition of url cloaking:- URL cloaking is when content is presented to the yahoo crawler that is substantially different from that presented to users' browsers. And i don't think i know how to do this also.