It's not a "mod-able" change to the hardware, it's a bit more low-level than that.

I decided that having the radio on after the ignition had gone off is a *much* more likely scenario than wanting to turn the radio on when you don't have the key to the car. To get it to wakeup you just have to put the key in, turn it for a second, then remove it (you don't have to wait until it's playing music) - the empeg will boot and then go into standby, from where you can wake it as usual.

Hugo
ps: Why do you keep replying to your original post, as opposed to following the thread? Makes it quite hard to read...