Ok, I understand you. At this moment I could suggest you small modification.
Open /modules/mod_jcomments.xml and after line:
<param name="exclude_catid" type="textarea" cols="20" rows="5" default="" label="Exclude categories" description="Excludes comments from a specific Category or set of Categories (to specify more than one Category, seperate with a comma , )." />
add new parameter:
<param name="exclude_articleid" type="textarea" cols="20" rows="5" default="" label="Exclude articles" description="Excludes comments from a specific Article or set of Articles (to specify more than one Article, seperate with a comma , )." />
Open /modules/mod_jcomments.php
Find line:
$exclude_catid = trim($params->get('exclude_catid', ''));
and replace with:
$exclude_catid = trim($params->get('exclude_catid', ''));
$exclude_articleid = trim($params->get('exclude_articleid', ''));
Note, that this line occurs more than one time and you need replace all occurences.
Find line:
. "\n AND cc.object_group = 'com_content'"
and replace with:
. "\n AND cc.object_group = 'com_content'"
. ($exclude_articleid != '' ? "\n AND (c.id NOT IN (".$exclude_articleid.") )" : '')
Note, that this line occurs more than one time and you need replace all occurences.
After this you'll be able exclude comments from certain articles.