Please move this to the top of priorities.
Since we're now all moving towards ACES which requires working in 32bit, not having a grain effect that works in 32bit makes most of the compositing work almost impossible to do. It's hard to think of an effect that doesn't require grain matching with the background plate, and now every time we apply the add grain effect all, overbright values get clamped, so we CAN'T use the effect on any new production :/