The AW4 is electric controlled for 1st thru 4th. So you need to address that first if you haven't already. The idea of the Rock is you have a shift controller in 1st(Rail or Baja), the Rock in the D position and can do the 1st to Rev thing, bammm! Does this help? Now the Rock 2 & 1 gear positions are for down hill compression braking. Drop the Rock into 1 and the Rail/Baja in 1st and creep down the mountain.
I haven't done anything with my aw4 yet, is that something your product addresses as well?