Stack a control ward on top of trinket ward late game

Can we get the option to stack a control ward on top of trinket ward, when we have no slots left for a control ward?? I have often found my self not haveing a slot for a control ward, when i would really like to get a control ward with me. I think, this whold really help getting more vision on the map :D -->

Let me hear what you guys think, do we need this option, or will it simply bee too easy to get the needet vision down ???

Post pros and cons if u like :D [slayer-pantheon-thumbs]