Thank you, Mike!
Michael, Since I was planning to use AIUs to control the switches, I decided to use the other ports to control power feeds. I bought toggle switches to make a traditional panel to turn track power feeds off. Then I realized I actually have two operating areas, the main one in the center of the layout, and another in the aisle outside the lift-up bridges. What if I wanted to be close to my enginehouse or sidings that are along the aisle and all my toggle switches were on the other side. I could have used two way switches, but decided if I had the DCS remote in hand, I might as well use the AIU ports.
I do not recall reading about in-line fuses when I read up on the AIUs last winter, but most of what I read has been overwritten. 
I put TVSs across every track feed at the track end. Yes, in-line fuses make sense. I will have to go back and see what is recommended. Thank you for asking the question.
