Wooho! Congrats The_Shane!
Allowing Developers to add new content after release has just become supported as of 4.8
Allowing people who buy your game to add their own meshes is not supported because the fbx pipeline runs only on the Editor side of the engine, which we are not allowed to utilize in packaged games.
I had a lot of work during the UE4 Beta to remake 3ds in UE4 (UE4 ), using the procedural mesh component.
Then you can even give people per-vertex creation capacity.
The challenge for me was generating good uv mappings via in-game tools
But so far, I dont think there’s any legal way to utilize UE4’s fbx importing pipeline in a packaged game.
Using my own systems entirely I could make a human-readible / editible file format which thus allows you to make custom .ini files yes.
But why do you need lots of custom .ini files? What is your perceived or actual use case?