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OK I'm gonna test both versions and post my conclusion later.

I have one question too.

How to type disallow pages in robots.txt?

Like this (native):
Disallow: /index.php?main_page=contact_us

Or like this:
Disallow: /kontakt

Lets say the page you want to change is /index.php?main_page=conditions, which represents "Conditions of use" page. In PHPMyAdmin, insert record with this values:

uri -> /conditions
language_id...