dc42:
OK, so you want the same push button to serve as an off-switch as well as an on-switch. In that case I think it would be better to keep the device permanently powered using a low-standby-power PSU. That's probably what your coffee maker does.
I see. It seems that I can have my cake if I put more logic (as well as power adapter) on the branch with the push button. Thanks for the input.