Yes I have. They are aware of the inaccuracy. No fix was mentioned, problem is multi year, multi bike.
My guess is they figure some of us will spend the bucks to install an oil temp gauge to replace the worthless rain gauge. So its a financial decision on their part to leave it as is. IMHO
Separate from the accuracy of the rain gauge; I've often wondered why it was ever put there to begin with. What product engineer had the somewhat questionable idea that someone riding a motorcycle, out in the elements, for miles and miles; would actually gain some benefit from an ambient air temerature gauge.
We are, literally, in the ambient environment as we ride. So how is it that an air temp gauge is more beneficial (or of any benefit) when compared to something like an oil temp gauge. Just always seemed an odd product choice to me.