I have an "author" category that is used as a list to browse multiple posts containing author biographies. I have Smart Category Ordering installed and right now it is sorted by title ascending. Unfortunately there isn't many options on this plugin and I haven't found alternatives.
Posts are titled "Firstname Lastname (country)" and I want Lastname (or some custom field value) to determine the post ordering for the AUTHORS category only. I have other categories for news posts I don't want affected. I've seen some ways to do it in PHP but that would affect the entire site.