The buttless starship may be legal in Germany, but it is a bitch when it comes to controllability. It "wants" to turn upwards, and even with light bands is hard to shoot it.
Then came the rope idea. Attached to the front, and beeing trod on, you have total control. There is even less shaking than on freehand shooting!
I have attached two layers of TB Gold, cut 45cm x2,8 cx 1,8cm, with 12 kg (26.4lbs) draw. Easy to control!
I encourage even the wrist brace starship shooters to try this simple mod. I think it may be good for control = accuracy. As you can see, it is easy to change your aim simply by moving your body a bit. No resetting of the foot is needed.