If you do this, I suggest you break the jumpers between the two outlets; that way you'll have both switched and unswitched receptacles. You should mark them, unless you want to drive the next owner nuts.
I, too, have trouble understanding why you want to do this. It basically means you have to leave the light on all the time. Maybe you're thinking of removing the bulb or using a motion detector. That introduces a new problem: How will you know when the receptacle is turned on without looking at both switches? Every time you have visitors, they'll mess with the switches, for sure. Why? I don't know, but that's what they do: flip switches and run the garage door up and down.