I have a rule when it comes to live releases: You can edit, but don't add/record anything that wasn't there in the first place. Let me give you an example, cleaning up the mix to sound better: crunchier guitars, making the audience audible if it's buried among the instruments... You get the point. But when it comes to use parts from other performances if you fuck up something or rerecord vocals in studio because your throat was sore... That's where I draw the line.
This is my personal take, I don't expect anyone else to like it, or to be the right perspective on this matter.
LP hasn't gone so far to make a KISS, if you know what I mean. But when the bootleg and the official live recording have notable differences, it doesn't sits well to me.