Michal, just crossed my mind.
Since you are advanced user you will not have a problem understanding how each marker works. In some of my styles (like this for wParallax) you can find some macros like mentioned for overriding with markers, taking values from X/Y Master Spline...
All those are working with nested generators as long you named main generator as "Master".
This is my main workflow. As I put the generator in the style I rename it as "Master" so I can use my predefined help macros.