Unfortunately this cannot be helped. Even wih reverse sensor
there will be an intial beep once you engage gear, and subsequent
seconds there will not be a beeping sound unless there is an
obstacle. If car manufacturers made more and more of such
user-friendly features then the point of driving will be invalid.
This kind of situations must always be aware and check on ur
dashboard or the actual gear stick to see which mode you are in.
Cultivate this habit and you will be fine on the road no matter
which knnccb is impatiently rushing you.
This also applies for manual transmission, although they taught you
not to look at your gear when changing.
Cheers