I agree. Alas, the Valheim forums wouldn't be the place to look/suggest this, since what you're suggesting is a mod for the game. Perhaps if there is a hub like Spigot/Bukkitcraft for Valheim, you can ask your request there? Reason being, I have a feeling most Valheim modders either rarely come to the Steam forums for this game, or simply never come here.

Seems like the perfect place to ask. He's got a direct solution to his problem right below his original post.

Case closed.

Of course you get the same result without coming here if you query your favorite search engine with this :

"valheim duplicate structure mods"

https://www.nexusmods.com/valheim/mods/1123/?tab=docs