I am not pretending anything in this post, except showing what are my yoke buttons settings. Maybe a good exchange of opinions of this topic will be profitable. Note that this yoke, from CH Products, is still perfectly working after seven years of intensive use (i am flying everyday), except for the omnidirectional/8 positions button, still working but not as smooth as before.
These settings result from 20 years of thought. Elevator trims, parking brake, throttle are non negotiable. I really need them on the yoke. The base button on the right handle is often used as rudders but i changed it for real rudders pedals that are much realistic. Note that on this yoke, i sticked a new item for charts. CH products could add something like this. I use one of the rocker switches for landing gear but the button doesn't offer the best access there, under the wheel.
CH product explains that there is 144 programmable functions with the control manager software. Next step will be to try this. The article here is not finished. I will try to update it until this week-end.
I just hope this can gives some ideas to some people.