Some general settings....?

[Sineos]

@4711Austria

I cannot change the M109 code made by Cura.

Of course you can:

You can put anything you like as start or end gcode. In the Klipper world we typically call own macros there that do what you think should be done. Example here Dual Loop PID, a accurate bed surface temperature - #13 by koconnor

@4711Austria

so the PID settings inside printer.cfg are the point?

See G-Codes - Klipper documentation