Doesn't that fly in the face of one of the premises that I think most of us can agree on, and which Jesus instructed, which is prayer for each other is good and necessary?
If you agree with this, what is the issue with asking those in heaven to pray for us? Are there prayers any less powerful than those of us here on earth?
This does raise the question of why you believe that they can hear you since they are not here with us and are physically dead?
We can ask lots of things, but it is a variation of the old "if a tree falls in the forest and no one is there..." God is omnipresent and hears every word spoken and those in your heart and mind even before they are spoken. thankfully!