I was just watching the 2017 GDC Tech Toolbox video, and I was really impressed by the ideas behind Ryan Williams’ DarkConfig tool: The 2017 GDC Tech Toolbox - YouTube. It’s a C#/Unity tool that allows for hot reloading of YAML configuration files during development and at runtime. It’s open source at GitHub - SpryFox/DarkConfig: DarkConfig is a configuration library for games which supports fast and e and leverages C#'s runtime reflection capabilities. I wondered if anyone was aware of anything similar for UE4/C++. I did a bit of Googling but had no luck. I could see such a tool being very useful for rapid iteration.
I’ve seen a system exactly like that for a game engine called Granny3D.
UE4 has support for INI files that could be used the same way.