@Douglas-Kryder - No it is my hack to make it recognize my SSD card as I need the space to play with NodeJS and SQLite which would not all fit on the base system. So my system is running the 17.02 lede snapshot under the covers and my ssd has the 18.02 overlays installed so I can access those tools.
Again just a hack till someone way smarter than me figures out how to get the 18.06 base system to boot from external devices.