Change default width in RTF?

I’m running DEVONthink on a 12’ iBook and hence have limited screen space.  I prefer the “Notepad” view, but the RTF windows always default to a 10" wide page, and the text of course spans that 10".  Most of my stuff gets into DEVONthink via services, and I end up having to set the first new import to an 8" width and then do a “Copy Ruler” command and paste that ruler into the rest of the items I’ve recently imported.  It seems like there should be a way to reset the default width, but if it exists, its not intuitive.  Is there a way?