To make a field configurable, here's what you need to do

1. Create a content-type with the correct name in the System.Fields scope
2. Add the fields you need like PredefinedColors, Range or whatever

If you did everything correctly, the forms system automatically detecs the matching names in the input-field and the type you just created. 

1. Just test it - it should work - otherwise do troubleshooting
2. Optionally you can also now export this type configuration and place it in the extensions folders