Honestly im not positive. I want to say no, the cable not only engages the trans but it also controls the throttle butterfly on the intake. I only say this because its the same tension threw the entire travel but im really not positive.
I have driven a few boats that have tight spots in the reverse and forward sections just after its in gear in order to add throttle and this makes me lean to being a cable to control engine rpm as well.
I will look in my boat today when i go switch some of the ballast around for the new owner. I have to remove 2 450 bags, 2 Y valves, and relocate the fill lines to the 900 bags lol. I roll deeper then the new owner wants to LOL.
My '08 had the cable for the tranny, but not the throttle.
2006 Outback V - Gone
2008 LSV - Gone
2013 other brand