I know this is in the pipeline, just opening a topic to raise awareness about this (great) feature and to let you know someone from the community is actually using it. And of course to discuss things.
I spent most of my day today editing instance properties by hand. It’s a powerful concept and (after some trial and error) I got to the point where I’m happy I rewrote things to use a template entity + instance overrides for the eight similar entities in my scene. But let me say, it definitely needs tool-side support!
Looking forward to the next Napkin release.