The KNR Author List plugin uses the standard WordPress tables for obtaining author information so it would take a bit of effort to get the KNR Author List plugin to work with Co-Author-Plus and to have it tested. The enhancement would benefit a very small number of the users of the plugin but it is something I would consider for the next version of the plugin if I do get a significant number of requests for it. I might even be able to collaborate with the author of the Co-Authors-Plus plugin to provide an interface I can hook up to.
If you are, however, looking for commercial support, either of the plugin authors can devote the time to build a solution for you (plugin authors have bills to pay too!).
