So, due to the peculiarities of my install I needed console access before an install was completed.
As it happens, I was able to make a change and get the console output before pfSense loaded and over-wrote my configuration, which was just enough to get what I needed done.
I will try other options to make this persistent as was mentioned in a previous post, but for a single-use I was able to make the change and use it the way I needed to.
Hope this helps someone in future.