I would suggest (if I get the meaning correctly) something like:
Code:
ksmGeometryValuesN=748x1014+5+5
ksmGeometryValuesS=748x1014+5+5
ksmGeometryValuesE=1014x748+5+5
ksmGeometryValuesW=1014x748+5+5
That should mean adding a 5-pixel margin on all sides, which then can be more finely adjusted by the user. (it seems the physical screen width is 758, not 768).