the s-rocker is on burtons fish and malolo boards as was stated in the video. both of these boards have a taper to them. The taper at the tail is what sinks it in pow and simultaneously raises the nose causing float and less rear leg strain.
NOw they have the S-rocker which pretty much gives you the same advantage of having a tapered cambered powder board, but at the same time, the R/C combo will also help out on hard pack and groomers.
Without me, my board is useless. Without my board, I am useless