I want to do more customization

I've installed wpDiscuz, I love this smart plugin very much, I've read all documentations, but I want to do more customization. I list my needs here:

1. I want to add a delete button beside edit button. (It seems that I must buy wpDiscuz Frontend Moderation?)

2. I want to like/dislike button works in Youtube like/dislike style, that is if you click like button again, it will cancel the previous click. (so do the dislike button)

3. I want to move the comments count which above the form to another place (for example under the form), I've learned class.WpdiscuzWalker.php, but the comments count isn't in this file.

4. In certain post, I want to the commenter can only see his own comments. the commenter can't see the comments posted by others.

For 1, I'm glad to buy the addon. For 234, if simple, can you tell me the code implementation? For 4, if there is a plugin that can do this, I'm glad to know it.