Just bought an X-T2 and installed the latest firmware, v3.00. I've selected the settings I want for ISO A1, A2 and A3, but I have not been able to determine the method for selecting one of the three settings. I would also like to know if I can set one of the function buttons or Q menu to give me quick access to that selection.
Press in on the front dial, and note which function the dial sets on each press. When it's set to ISO there's a dome icon over the "ISO" setting indicator in the display. There you can scroll from the lowest ISO through to the 3 auto ISO options.
If you set the exposure compensation dial to C, pressing the front dial adds an option of being able to control EC with the dial as well.