I too experimented with light (almost no) touch, but with my middle finger--forefinger dropped, and last two curled but not really touching. It's been over 30 years, and I don't even remember why I was trying to shoot that way, but I do recall it helping with smoothing out delivery. Of course, like most experiments, the practice fell to the wayside, although it's also something that I think sort of leaves a subconscious impression, that "informs" overall *feel*, and therefore there is benefit--although very hard to measure/quantify.
The "grip" is also basically the same for when I recommend practicing pointing the forefinger straight down, to control undesired, side-to-side, wrist movement.