Hotkey sub-categories for Nodes

For now, all hotkeys in any of the Node Editors are bundled together.

If I hotkey "Ctrl+B" to the Brightness/Contrast node in the Shader Editor, then I can't also bind it to the Brightness/Contrast node in the Compositor. Instead I get an error.

It would be nice to separate the Node Editor into multiple sub-categories similarly to the 3D View.