Jerry Byrd sometimes used a "backstroke" with his thumb pick. I use it all the time with steel and guitar.
Jerry used National thumb picks. Herco picks are a little soft for this technique.
Saves time going around strings.
I often play guitar with a dropped "D" and often alternate on the bottom two strings (1 & 5) using this technique.
The tone of the thumb nail on the bottom string adds definition.
