We're also concerned that the 'Bkground defocus' mode is simplistic to the point of being misleading. When presented with a scale running from 'Defocus' to 'Crisp,' most people will push the setting all the way to 'Crisp' if they want in-focus backgrounds and yet doing so will push the camera to tiny apertures between F22 and F32 that will make their images softer (because of diffraction) and less detailed (because of the high ISO settings and accompanying noise reduction needed for working at such small apertures).
There's a similar problem at the 'Defocus' end of the scale: if you use the kit zoom lens, then part of the 'defocus' end of the scale becomes unavailable as you zoom-in (because the long end of the zoom has a maximum aperture of only F5.6, not the F3.5 at the wide end). This clearly suggests less ability to defocus the background, but in practice 55mm F5.6 will give much more defocused backgrounds than 18mm F3.5 (because the level of background blur is dependant upon focal length as well as F-number).