I have been playing with my x100t, getting ready for some family holiday pictures. As my family is the one saying hurry up, I don't want my picture taken, I have to be ready, so below is what I have found works great. The Fuji EF-20 with the diffuser bounced off the ceiling really makes a big difference. After Christmas I will post some pictures.
Fuji x100t, I shoot in jpeg
Manual
Film mode: Astia
ISO 400
Aperture f/4
Shutter 1/60
Flash Fuji EF-20, bounced off ceiling, with a stop fen diffuser
Note** make sure wrench 2>screen set up>preview exposure in manual>off(this let you use viewfinder without it looking under exposed do to using flash
