Thanks for the wonderful comments.
Talked to Taylor. They aren't doing cedar topped 12 strings at this time, not because of string tension or anything else, but because of availability of the quality cedar pieces (thickness, plyability, grain, etc) needed to be a 12 string top. They said the ones that have been made are special, because there aren't too many of them. They said the warmth in cedar/mahogany is especially sought after by fingerstyle players. No wonder I was drawn to the sound of this guitar. Also, tune it to standard pitch with light guage strings, just like all their 12's.