No question this is one for the manufacturers. You might even want to MOR it, just to put a bit of energy into getting this resolved.
To my possibly naive way of thinking, the aural warnings relating to CWP captions are exactly that, an attention getter that an important CWP light has come on. They're not some sort of generic advance warning of unspecified impending problems.
Either way, the way it ACTUALLY works should be in the RFM.