Comment 1 for bug 156575

Nice to have but I don't think it's that simple.
Installing pkg-create-dbgsym will *build* the ddebs, but it will not install them.
I don't know what tools are used to populate the PPA and update its indexes. I fear it's not even publicly available, I hope I'm wrong.

On a similar topic, I've posted a while ago a patch for dpkg-scanpackages that I use for my own repositories:
https://bugs.edge.launchpad.net/ubuntu/+source/dpkg/+bug/134150
It has been ignored so far :(