Oh and all the blending and HDR tools inside hugin are completely wraparound stitch aware.
> editing in a nadir logo or title would also be complicated by stitching the exposure brackets separately first.
I do this by taking a final completely worked up equirectangular output and converting them to a cubic panorama (i.e. 6 square tiles) using the "erect2cubic" and nona command line tools from the panotools perl script collection (some instructions here Vinay's Hacks: November 2010 On mac os X you can also install the scripts using MacPorts) and editing the bottom square. Then I convert them back to a equirectangular pano using cubic2erect. This works perfectly. An example here: Views - Google Maps.