Describe the feature

So I was working on the roof of my house and realized a piece is missing...

currently this is the best you can make (unless I am stupid, if so please correct me)

or possibly

But something just doesn't feel right... There is just a part of a block missing. Picture to illustrate what I require (I made this quickly so it's imperfect):

I understand why this hasn't been added as it is mostly only useful for roofs like this, but I still think it's a good addition. Again if I something is incorrect please do correct me :)

This kind of block is indeed currently missing. It definitely makes sense though, I'll add it to the planned blocks.