Adding new custom airframe for multicopter

HI all,
So I am following this tutorial https://dev.px4.io/en/airframes/adding_a_new_frame.html to add a new frame. The tutorial https://dev.px4.io/en/concept/mixing.html mentions about the option R: such as

R: <geometry> <roll scale> <pitch scale> <yaw scale> <deadband>

For example, from tri_y_yaw+.main.mix file, there is

# Motors
R: 3y 10000 10000 10000 0

My questions are:

  1. How to create a new option similar to the option 3y. What the steps should be done?
  2. Take the option R: 4x as an example, what are the differences in term of functionality between the following mixer files

R: 4x 10000 10000 10000 0

and

//Motor 1
M: 4
O:       10000   10000     0 -10000  10000
S: 0 0  -10000  -10000     0 -10000  10000
S: 0 1  -10000  -10000     0 -10000  10000
S: 0 2  +10000  +10000     0 -10000  10000
S: 0 3  +10000  +10000     0 -10000  10000

//Motor 2
M: 4
O:       10000   10000     0 -10000  10000
S: 0 0  +10000  +10000     0 -10000  10000
S: 0 1  -10000  -10000     0 -10000  10000
S: 0 2  -10000  -10000     0 -10000  10000
S: 0 3  +10000  +10000     0 -10000  10000

//Motor 3
M: 4
O:       10000   10000     0 -10000  10000
S: 0 0  -10000  -10000     0 -10000  10000
S: 0 1  +10000  +10000     0 -10000  10000
S: 0 2  -10000  -10000     0 -10000  10000
S: 0 3  +10000  +10000     0 -10000  10000

//Motor 4
M: 4
O:       10000   10000     0 -10000  10000
S: 0 0  +10000  +10000     0 -10000  10000
S: 0 1  +10000  +10000     0 -10000  10000
S: 0 2  +10000  +10000     0 -10000  10000
S: 0 3  +10000  +10000     0 -10000  10000

Thanks in advance.

@langxm1223 Hi langxm1223, would you mind help me to clarify these points. Thanks in Advance.