I am all for this suggestion! Like many others, I have cats that I only keep because... well... they're cute and stuff... but it would be good if I could turn off their milk-drinking, since I do not really NEED their kittens.
-Then my top-breeders could drink their milk in peace and get their kittens every week, while my "Hey-I'm-just-here-to-look-cute"-cats could sprawl out and relax and just pop a box every 10 days.
Puurrr-fect