madkat,
Having trouble visualizing.... Were the 2X12's an exposed beam in the room? Or hidden above the ceiling? If above, how were they secured to the rafters? My wall runs perpendicular to the rafters.
What gets me is that it is a penninsula wall. There is a 6 foot gap until there is more support. When looking in the attic, there is nothing extra, nothing different between the supported rafters and the 6 feet of unsupported rafters. I dunno, just told it was a support wall and don't really want to chance my roof joining us in the living room someday.