Something you can do to minimize that noise if your static, is pitch your tent under tree cover. You can also run a line of cord over your tent and place some laying boughs over them, though its a bit excessive. I will certainly notice less noise in dead fall shelters than my rainfly'd tent though its not nearly as comfortable.

I suppose depending on how much auditory level you need you can switch out your rain shells hood for a gortex, windstopper type of watch cap.

The fact is regardless if its falling on you or just falling, the sound of rain is going to create a lot of environmental noise. Even if you are in a dead fall with watch cap, the rain falling on everything else will mute sound travel.