I figured out how to use custom properties in shaders and the compositor ( Shader AOV). Here's a quick cheat-sheet to get you started. : r/blenderTutorials
properties - Material use custom property of Object - Blender Stack Exchange
Custom Properties — Blender Manual
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python - How to show custom property as enum? - Blender Stack Exchange
Materials and Textures - XPlane2Blender-docs
Can I use object's Custom Properties inside Cycles materials? - Blender Stack Exchange
Pass object custom property to material via OSL script - OSL Tests and Support - Blender Artists Community
Custom Properties - Blender Exporter
110458 - UI: Add initial UI support for ID pointers custom properties - blender - Blender Projects
materials - Per-object custom properties in shaders - Blender Stack Exchange
Batch add custom properties - Python API - Developer Forum
Depsgraph updates and basic uuid support using custom properties - Python API - Developer Forum
Use Fewer Materials with Custom Properties — Blender Tutorial - YouTube
Can I use object's Custom Properties inside Cycles materials? - Blender Stack Exchange
Set shader input from custom property of Material (not Object custom property) - Blender Stack Exchange
Creating Custom Properties in color, degree, float, and Booleans Value | blender 2.9 - YouTube
How to Display Custom Property on Properties Editor in Blender Addon | Nakoblog
materials - Per-object custom properties in shaders - Blender Stack Exchange
Blender 2.79 - Custom material - need specific texture 'slots'. - Python Support - Blender Artists Community
materials - Use custom properties (variable values) in the node editor - Blender Stack Exchange
python - Adding Other types of Custom Properties - Blender Stack Exchange
