disable automatic selected "Allow comments to this entry" for each entry in serendipity (s9y) blog system
For real, I was searching for this option for a year now and couldn't find an answer in a readme.
By disabling users in an other setup and restricting other users right, I found the magic checkbox I was searching for. Following the clickpath: Settings->Users->Edit User->Default settings for new entries->Allow comments to this entry Choose the radio button "no" and everything is working as expected :-).