Searching through more threads here, I found this nice writeup:
https://www.ft86club.com/forums/showthread.php?t=24614
That and other threads confirm the 19ft lbs caliper bolt torque.
But that and other writeups here on site, do not mention any use of loctite, anti-seize or other compounds on the caliper bolt threads.
So I'm probably going to not use anything on the threads. Unless someone or Subaru recommends something, please let me know.