Bumped for posterity... I came along here about this problem, now in 4.7.1001, under Vista Home Basic at 120DPI... still placement issues on the splash screen.
Also, when addressing this, it would be cool if you can check out if it's possible to provide scaled up system tray icons under higher DPI settings, since these are also expanded. All programs I've used don't do this, leaving them pixellated, but the synaptics touchpad icon tries to update its pressure display as if it were still 16px square, which makes me think that larger icons could be possible.