Good luck with Tormach giving you a post...
I was ready to buy a machine..called Tormach, asked if They could put in a 5axis driver for me... before I got it out of my mouth guy said no, won't work. Asked a couple of other questions and he said no before I got it outa my mouth again.
Bought an Industrial Hobbies machine all prewired and set-up for 5axis. And IH is available with help all the time. It took a little longer to get the mill built but worth it.
If you haven't bought the Tormach yet, give Industrial Hobbies a call!