Describe the project you are working on:
I am making a level pass level game, have AI enemy and BOSS
Describe the problem or limitation you are having in your project:
Unity and Unreal have AI Behavior Tree Editor, I come from Unreal, It is very important for a game maker to make a complex AI. Now I can only use plugin for this feature. Create an Editor to let game maker more easy to manager their Behavior Tree nodes.
Describe how this feature / enhancement will help you overcome this problem or limitation:
If Godot has some kind of AI Behavior Tree Editor, It will more easy to make AI and change AI logic.
Show a mock up screenshots/video or a flow diagram explaining how your proposal will work:

Describe implementation detail for your proposal (in code), if possible:
If this enhancement will not be used often, can it be worked around with a few lines of script?:
You can make it by script but should make many lines to do it. And cause a big mess up.
Is there a reason why this should be core and not an add-on in the asset library?:
It is very often meet when you make a game AI.
User FruitPunch on Discord just posted this Behavior Tree addon:
https://www.youtube.com/watch?v=RD0v25tORYo
https://github.com/fian46/addons-btree
This would be really helpful for my game. :)
@HeadClot Please don't bump issues without contributing significant new information; use the :+1: reaction button on the first post instead.
Most helpful comment
User FruitPunch on Discord just posted this Behavior Tree addon:
https://www.youtube.com/watch?v=RD0v25tORYo
https://github.com/fian46/addons-btree