This sounds like a stretch, but I believe you are not the only one and a lot of people want to add creative plot lines and NPC.
People just do not have the coding skills to do so.
Right now there is a system that makes it "easy" to add pictures for various races, etc, through the improved random portraits mod and related tools.
But there is no way to easily add storylines with specific NPCs. Imagine if you could create a "container" mod that allows people to share their extra NPCs and extra plot lines easily, where compatibility between different creations would be guaranteed.
Of course the features will likely be quite limited compared to being an experienced modder, but just being able to add custom characters (pictures/stats) and simple events ("if day == X then do" and "if event1 done then etc") would be great for people with ideas and without advanced coding skills.
For example, the mod would load an extra folder named "ExtraPlots" where each story-subfolder would contain
- a text file describing custom character stats and pictures relative location (can be set to "none")
- a text file containing events to load in the morning or in a map (like "if (day == X) and/or (Event1 == True) then print text/choice") with simple options (like "add/remove specific unique character/item")
- extra pictures if needed
Each subfolder would have their local variable names treated differently in the system (not sure how to differentiate, maybe a list of lists, each list being the list of variables/triggers of a specific story-subfolder).
People would be able to share their creations and their custom stories without multiple stories conflicting with each other (that would probably requires that it does not interfere with main story, but who knows what is possible?).
I have no clue how the Godot engine or the game works, so this might be impossible to create. But this game is alive thanks to modding, and giving extra tools for "not-good-at-coding" creators sounds like a good idea.