If there are a few off-key moments or screw-ups, just fix them. I've heard a lot of fans praise James in the concert threads this year, so there probably isn't a whole lot of stuff that needs to be edited. I understand why some people want no overdubs, but fixing live albums in the studio has been normal ever since the 70s (maybe even before that). But as Marco said on the first page, there are always bootlegs if you want to hear recordings that are 100% live.