Realistically what you expect coders to do with the game? The only mods I expect someone to do for free would easy ones like changing the stats for saves (which already exists) or changing the text for dialogue or the name of characters. If someone is good enough and dedicated enough to make new sex scenes, minigames, events, etc, they would just make or sell their own game. Like what
TiramisuLntr is doing.
In fact if you want more NTR-Legend like features go check
TiramisuLntr's game. It will be released soon. You can probably get what you want there. Also you can talk to the developer directly. You could get what you want by asking him.