Suzuki have the same idea built in, I can say that I hardly ever use the option, especially on a cat, BUT... it is good for when you are (say) at the ramp or at home and want to trim the motors up/down for some reason, a simple press of either trim buttons operates both motors together. I think that is what I read in the link provided enables?
I found a picture of my controls, if you look real close on the front of the control box, you can see symbols of a single outboard, and two outboards, there is a rocker switch that you simple have in one position or the other, and the trim them works single or both motors.
Ha ha you guys are classics!
The trim is for opposing motors to trim imposingly!!
Yes I have the built in trim buttons that can trim seperate or together its hard to go diagonally at once!
Not too sure there is a real need to trim both motors at once, very rarely do you ever have the motors set the same either diagonally or together, the trim is determined by conditions (of course) and that is so variable, especially on a cat because the motors are on each corner, they have a big impact on hull behavior, unlike a mono where the motors are mounted more or less on the centre line of the hull.