Adding subtle noise texture to UI elements can look great. Try it using our Noise Fill mode
I think this effect should be available only for images or maybe as an export parameter for our pages. I don’t really imagine add noise individually for each layer.
For other hand, I guess the most appropriate panel for this feature should be the effects panel instead fill panel.
Btw, when we add a noise, is imposible change the opacity of the layer!
Thanks. I have filed this issue for fixing.