Editor
Information on the in engine GUI.
Categories:
Performer
Performer Targeting
Sequences
Localization
Nodes
Start / End
End
Restart
New Sequence
Specific Node
Dialogue
Text
Animated/Stylized Text
Performance
Posing
Pathing
Portrait
Trigger Timeline
Sound
2D
3D
Option Menu + Choices
Actions + Set Record
Conditions
How to use conditions to determine path.
Not always related to player choice.
Timeline Integration
Start Sequence
Continue Dialogue
UI
O3DE Editor Menu
Editor GUI
Adding icon to editor is a complex problem, outlined by Nick. 
Sequence Window
The Inspector Window can have any number of sub-tabs. Which might be valuable for adding unique settings, or multiple Conditions, for example. Basically component-ize different node types.