I was distressed that I couldn't use the analysis layout feature for searching non-biblical texts like Josephus. I was so excited about categorizing the occurrences of the optative in Josephus & Philo by lemma only to discover the analysis layout wasn't available.
I do hope that this will be added/extended to be used with texts outside the Bible. Its one of the best features in Logos 4 and limiting its corpus to only the Biblical text is like giving me a Ferrari and then telling me there's governor on thit preventing me from driving it more than 30 mph.