My best approach so far, though not without errors, is to set the camera.rect = new Rect(0f, -0.05f, 1.05f, 1f);
However, this raise the problem that NGUI's new anchoring system do not work, because it do not account for the new width of the cameras rect. Is there anyway to work around this?
I've attached a picture, which hopefully explains the issue
EDIT: I found that this is happening only if any clipping is present on the panel, or if Offset is checked