Cassio

my radios have a 3 position switch (8U and 9Z), not sure about the 6XAS - although it's a fine radio. you are not required to have them on a 3 pos switch, that's just my preference because it emulates a full-size aircraft, more or less.

I don't like the knob because it's hard to turn while flying the plane, plus I can't tell where the control surface is.

I don't know how to use 2 switches like you said - maybe make one switch a master 'on' switch for flaps and the other being 1/2 down and full down?

Again, these are just my ideas and opinions - do what's best for you.
Good luck with it!
- Scott