Agreed, in fact I have seen a couple designed for use near kitchens that have exactly that feature, however they are more expensive so lots of people won't buy them, if they even know they exist.

It would also be useful if you could silence a low battery warning for 8 hours too. So when it starts bleeping as you are going to bed and you don't have a spare in the house (not that spares are ever a problem in this particular house!) you are not tempt to just remove it for an undisturbed nights sleep.