Screw having to run a project through a useless render pass.
If you happen to be the unlucky one that got a 5D MII sensor with a dead/stuck pixel, send it in to be remapped. Why keep it when others don't' have that issue with their 5D MII; and you paid the same money they did.... I know a few people who's 5D's don't have any issues. From the flames of Hell would I keep it if others don't have to live with a defective sensor too. If Canon can't map it out, they will swap sensors. If you just bought it, return it, get another. That's what I recommend.....