The next thing I have to figure out is how to change comments in Blog Module:

The thing is now they allow entering custom Name.
I wish them to be so that a person has to login and that Name field is filled with persons login data (name, surname, e-mail, whatever).
I will play with it myself, but if som1 here has done the same thing and knows an easy way to change it I would be thankful!

Come to think of it I want it to be so all over the web site so basically it means overriding the built-in page comments

Found built-in function to do that. Solved!

For those that might need the same thing:

put:

PageCommentInterface::$comments_require_login = true;

in /mysite/_config.php

Sry for spamming the forum!