When I do the radio switched off and I have to push the start button without foot on the brake to turn i back on, well by accident I found if you leave the car in "D", foot on the brake, then push the start button the radio stays on but ignition and engine are off. Then you can move from "D" to "P" in your own time before you want to start and move again.
I know somebody asked if you could do this some time ago, well you can
