2
Ok, I found includes/storyform.inc.php
and this area:
//TODO: Check that pubinhome is 0 = no and 1 = yes (currently vice versa)
$sform->addElement(new XoopsFormRadioYN(_AMS_AM_PUBINHOME, 'ihome', $story->ihome(), _NO, _YES));
But not sure how to change the defaut value...