The graphical tools DO list the same options as the xrandr command. That
means that if the autodetection has failed to identify a valid mode by
autodetection, you are screwed unless you like to edit xorg.conf. Then
these options show up in xrandr and in the graphical tool.

To fix the problem I had to manually generate a line using gtf thus...
 
c...@cefn-linux-dell:~$ gtf 1440 900 60

  # 1440x900 @ 60.00 Hz (GTF) hsync: 55.92 kHz; pclk: 106.47 MHz
  Modeline "1440x900_60.00"  106.47  1440 1520 1672 1904  900 901 904 932  
-HSync +Vsync

Then weigh in and edit my xorg.conf, based on the output identifiers
reported by xrandr. The xorg.conf for my specific monitor follows, but
it took me the best part of half a day to work out enough about this
problem to solve it.

My mother wouldn't stand a chance, even if she could tell perfectly well
what the values of horizontal pixels, vertical pixels and refresh rate
actually were, since it involves manually editing config files in
mysterious and ill-documented ways!

Since the bug/feature request is about the need to avoid manually
editing config files, and I'm providing information about it, I don't
know why you keep re-closing it?

You only gave me an hour to get back to you this time before re-
reporting the bug/feature request as closed. Maybe I don't understand
the status reporting properly, or the nature of the bug and where it
currently is in the system, so forgive me if I'm confusing matters
somehow and let me know how to file this request properly.

Anyway here's the example xorg.conf which could be generated by the
graphical tool from those three parameters to help my mum out. Grandr
already does the Virtual resolution bit automatically just the same way.
What I'm suggesting is adding three fields to the gui tool (in my case
1440,900,60) and an invocation of gtf, followed by an automatic edit of
xorg.conf and a message to re-log-in, just as it does with the Virtual
resolution line.

Section "Monitor"
        Identifier      "Configured Monitor"
EndSection

Section "Monitor"
        Identifier      "VGA"
        Modeline "1440x900_60.00"  106.47  1440 1520 1672 1904  900 901 904 932 
 -HSync +Vsync
EndSection

Section "Screen"
        Identifier      "Default Screen"
        Monitor         "Configured Monitor"
        Device          "Configured Video Device"
        SubSection "Display"
                Virtual 1440 1700
        EndSubSection
EndSection

Section "Device"
        Identifier      "Configured Video Device"
EndSection

-- 
Unable to force screen resolution with vtswitch/splitter
https://bugs.launchpad.net/bugs/260436
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