PAL RGB monitor support

Hello

I need to support a PAL RGB monitor under Windows2000; resolution of
the screen is not standard, actually is 656x270, with a 13.5Mhz dot
clock.

I was able to support this monitor under Linux, just adding the
monitor section with the corresponding modeline in the XF86Config
file.
Is it possible to do something like this under Windows, or do I need
to modify the driver to support such a monitor? Is it enough to modify the
monitor.inf file?
What if the requested mode does not belong to the list of all modes?

In general, is it possible to support non-standard display modes, with
custom resolution, frequencies ....?

Thanks for the attention

Corrado Clementi