And it saves me from building separate kernels (1drive vs. 2drive) like I used to do prior to this feature

I figured that once I saw the new option for the first time when I was helping my friend get used to his new toy.

Hugo did indicate autodetection code might make it's way in one day to speed up car boots when only one drive is present. I believe he was going to have it coded to always check for two drives on AC power, (incase it gets upgraded), then just note the number of drives in flash for car boots.