Disclaimer: I don't know what I am doing. This seems a bit more complicated than other solutions I have found (since I had to use the Sub Trim) but it works with what is the latest T8J firmware (I think I have the latest but cannot confirm since I see no way of knowing the version # or upgrading the firmware).
These are my settings. I had to use the Sub Trim to move the PWM output of the C switch in the middle position so I would have access to the third mode with D off and fourth with C on (up).
I would welcome feedback if you think there is a simpler way to do this. My screens just didn't match the example that the Wiki points to (http://diydrones.com/profiles/blogs/acmapm-futaba-t8fg-super-mode) or other posts here regarding the T8J.
I assume this is going to become a fairly common radio since it has an SBus receiver and is not too expensive) through the new Taranis looks great.