The modifications refer more to improvements, not criticizing... These are some suggestions that might can improve the forum.
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It is generally known that the absolute majority of users wants Edit button! Mistakes are possible, we all make mistakes.There is no unmistakable user. We all want sometimes to fix or correct the post that we made.For example, I missed to tell something, and I think it's important, I'll have to post it again. And not everyone is good with English grammar and spelling, and when he noticed that something is wrong, he can correct it.
In any case, Edit button would improve the quality of posts.
But since abuses are possible, there should be a time limit in which the modifications are possible! Or other limitations, for example you can only correct the last post that you made. Or is it required to put the reason for the correction.
Post editing is planned for the future and is, and has always has been, on high demand.
As for the forum history I forget whether or not it's planned but it is another thing that is on somewhat high demand so it is likely to come eventually.
I was thinking about communication improvement,not only on the edit button,when I write something on the forum I would like to know who is online and who is offline.
Online status on forums: so you know if you can expect a response soon.
Edit button: for eliminating those stupid little spelling errors, or for updating the OP with new information, especially useful if FRPGs where you may change the rules.
Spoiler tags: so you don't ruin something for someone because they innocently read your post
Code Tags: so you post easily readable lines of code for feedback.