It is a nice idea, but is simply difficult/almost impossible to implement into the game.
When we make 3D items, we need to scale and position them in the 3D program itself.
If the devs find a way to make it possible to move them in-game, overwrite the existing .obj file in the custom folder in the same time and then upload it to the torishop so everyone can download that .obj while being in-game to see your tori with that edited version of the 3D item...it would have a few problems.
One of them being that the fact that we cannot overwrite the original 3D item itself, there would be way too many "edited versions" that are "created" with each having unique coordinates/rotation values, resulting in WAY too many items in the tori shop.
In a nutshell, the torishop will be FLOODED with copies and copies of hidden .obj files/3D items with different names and IDs, which is not really good.
Until the devs find a way to do this without using the torishop or so, I will have to say that I am not supporting this for now.