Actually, here is what is posted on the Carolina Archery Products website for finger shooters:

"Will the Whisker Biscuit Arrow Rest ® work with fingers?

Yes. The Whisker Biscuit Arrow Rest T works well with fingers. When paper tuning a bow for finger shooting, the shooter must keep in mind that the normal tear shows nock-left for right hand shooters and nock-right for left hand shooters. It is possible to tune a bow with this rest on it to shoot a bullet hole using fingers, but you may notice that the arrow angles to the right of the centerline of the bow, and thus it will shoot to the right (for a right hand shooter).

If it isn't already, you may want to set up your arrows with the cock feather out. This will provide a larger profile of feathers in the vertical plane, which helps stabilize the arrow faster for finger shooters. Just remember to keep the arrow close to the vertical centerline of the bow (just to the left of the string), set the string nock about 1/4 inch high, and you will get good results."

I would guess that you are referring to shooters that use a release. But anyways, from the angle in the picture it may not seem that the vane facing the cable is that close, but it really is. Not to mention when the bow is pulled back and is released, don't the cables torque closer? Maybe I can find a better picture...