At the top of the PluginFurnitureCatalog.properties file in a .sh3f file you can add a few library properties. The ones I know of:

id=
name=
description=
version=
license=
provider=

Since you can't add a custom property that is preserved when you save the file in the library editor I wondered if there are other properties that are supported?

Second question:
How do you remove a planicon other than manually editing the properties file and removing the image from the .sh3f zip?