You can add that yourself like this:

modded class Object 
{
    Param2< vector, vector > GetPosYPR()
    {
        return new Param2( GetPosition(), GetYawPitchRoll() );
    }
    
    void SetPosYPR( Param2< vector, vector > params ) //or pass a string and split and reinterpret that as your two vectors
    {
        SetPosition( params.param1 );
        SetYawPitchRoll( params.param2 );
    }
}

If you really need it, feel free to use my code example version and modify it to your liking.
I don't see a use case for having both operations combined. You usually only modify one of the attributes when hard coding an offset.
So we don't really need this added into vanilla.

"Engine Class 'Object' can not be modded"

Ah okay, too deep down. Perhaps Entity or EntitiAi works out. If none of the general base classes work for you, you can have a look at what kind of objects you use it for. If they are all items, you could use ItemBase