Ohw, I guess that is also the answer on my question on How to create an operator for the mapping node (scale) where I try to find a solution on how to add a slider in the Panel to adjust the scaling of a Mapping node. I’ve spend a whole day on figuring that out, and have seen all kinds of things like handlers, persistence, FloatingProperty, etc come across. It’s probably not that difficult, but its so easy to get overwhelmed trying to grab info all over the internet.