Kudzu handles this beautifully. Only the X config needed a little twiddle:
Section "Monitor"
Identifier "Monitor0"
VendorName "Monitor Vendor"
ModelName "Unknown monitor"
HorizSync 30.0 - 72.0
VertRefresh 50.0 - 130.0
Option "dpms"
EndSection
and added 1024x768 to the Screen Modes section:
Section "Screen"
Identifier "Screen0"
Device "Videocard0"
Monitor "Monitor0"
DefaultDepth 16
SubSection "Display"
Depth 16
Modes "1024x768" "800x600" "640x480"
EndSubSection
EndSection
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