Peaking has often been requested for the hack, but it's very difficult for Vitaliy to add new features to the camera. However, there might be something else that can be done to make manual focusing easier. As we know, when you enter record mode, a mild sharpening is applied to the viewfinder and LCD. Now, it might be possible to increase the amount of sharpening to make focusing easier. Since this is an existing function, hacking it would seem to be in the realm of possibility.