I was wondering if there is any way i can disable/ modify the beheaviour of the Act Led from the CM3 board, the rgb led and the LEDs from the ethernet ports from the e23 .
Yes you can remove the led node from its dts and recompile the dts to dtb.
Radxa E23 RGB LED can be controlled via sysfs.
See https://wiki.radxa.com/Rock3/CM3/e23/getting_started#LED
I’m afraid not.
See https://wiki.radxa.com/Rock3/CM3/e23/getting_started#Ethernet