2
Yes it is possible.
find $modversion['config'][1]['options'] = array('5' => 5, '10' => 10, '15' => 15, '20' => 20, '25' => 25, '30' => 30); in modules/news/xoops_version.php and change it to
$modversion['config'][1]['options'] = array('1' => 1, '5' => 5, '10' => 10, '15' => 15, '20' => 20, '25' => 25, '30' => 30);
or whatever number you want to display.
Upload the file and update the module. You should now be able to select the number in news module preferences.