I 've attached the different Keyboards in the order Omni english, Omni german, CM english, CM german.
Omni english has all keys with a second function but the colour of the second function ist black on Grey.
Omni german has no second function on the y-m-row.
CM english is like Omni but with light Grey on dark Grey.
CM german has no second function on keys a and s.
I preferred CM-Layout with second fuction on all keys. light Grey on dark Grey is better readable to my old tired eyes than black on Grey. Better would be for me to have the colour of the second function in White, not Grey.
At the Moment I allways replace the Omni-Keyboard with the CM-Keyboard for better readability and to have more keys with second functions.