There won't be any restricting of editting.
Cogito is clearly in the wrong. He should not have accused Doc of 'misquoting' him. That the edit had taken place 5 minutes before Doc posted in no way puts Doc as culpable. The post where Cogito 'informed' us of the change was directed to JustLiz, and its very easy to skim or even pay little mind to posts explicitly directed towards other people.
Given the fact that Cog well knew he had just editted the comment only moments earlier, he should have had the good sense not to accuse anyone of 'misquoting.'
Doc might be overstepping in thinking that this was deliberate, but his 'mistake' is exactly the sort of thing that can happen when you go about editting posts, and Cog should have simply pointed out to Doc, without insinuations, that he had revised the premise.
If we look at the statement again:
"Your point has merit although you've misquoted my premise 3. Actually it says, "According to Christian theology, all things in the universe were designed by God; thus, no particular thing in the universe was NOT designed by God."
There is not a hint of fairness respecting the revision. "You've misquoted..." "Actually it says..." clearly portrays Doc in a certain light. He was right to be angry.
If Cogito can't see his way to apologize, I wouldn't blame Doc for continuing to be angry.
Not that this matters for the integrity of the argument... not the argument, at least...