Quoted from mima:
As I now know that this is currently not a option for Goldball I suppose I need to revert to the soldering of resistors on the lamps. However how do I workaround that the controlled lamps (for the most part) is mounted on two big light boards?
You can bend the leads of the resistor and put them into the socket, alongside the LED bulb.
Depending on the socket, the resistor might be on the side of the LED, or slightly above it.
No soldering needed, and you can easily lower your resistor value should your MPU require it.