Eh.. not for me. I love a nice smooth finned betta and when you get into mixing anything with CT your just asking for ugly fins. You may get one decent looking fish out of a whole spawn. I just don't want to have to cull that hard to get what I want.
I personally love Halfsuns....well, certain halfsuns. I've seen some bad ones, but I've also seems on really beautiful ones. It'd probably be a challenge getting a good line of them going with steady genetics...but if your willing to work at it, I think its a good breeding goal ;) Its unusual, and who knows? It might be the next hot thing xD