Won't actually try it. I just thought it made a good picture. It would be a handfull trying to control 2 tillers anyway. If I was going to something like that, I'd just use the 70hp I have in the garage. the pair of 25s weigh more than the 70.
there was a thread a while back, on linking to tiller controls together. one of the guys post while in one of the 3rd world countries, the ferry boat was a dual engine tiller with the captain, standing between the tillers. controling the boat.