I am the maintainer of witty, a C++ library for web development.
In addition to the latest version of Debian, I provide backports of the package for all the supported versions of Ubuntu in a PPA, and for Debian oldstable in an OBS repository. I have been doing this for years.
So far, people find about this repositories in the Wt website. Many Ubuntu users do enable it. I was wondering if it would be acceptable to add a debconf question to the official package. Something like:
"Do you want to enable an external repository which will provide you with the latest version of Wt?
This repository is maintained by the official Debian/Ubuntu maintainer but it is not endorsed or supported by Debian/Ubuntu."
Answering "yes" would install a /etc/apt/sources.list.d/wt.list file.