Of course it is! It is specified in the metamodes option (device section), usually you specify the list of modes you want for each monitor, e.g. for 1200x800 on the lcd and 1024x768 externally, you would do "1280x800,1024x768". However, check the man page for the driver (if you have one) as the syntax may be different or you might need to specify other options too (never used an sis card, so I'm not sure).
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