Ares, that's not really true. For instance, I could have given such a code:
$members = ssi_queryMembers('FIND_IN_SET({int:id_group}, additional_groups)', array('id_group' => 12), '', 'real_name', 'array');
$member_list = array();
foreach ($members as $member)
$member_list[] = $member['link'];
if (empty($member_list))
echo 'There are no members.';
else
echo implode(', ', $member_list);
But you wouldn't learn anything from that. The next time you need to make a little modification to that, you'll need to ask for help again.
I admire the way AngelinaBelle helps. (she is a brilliant support specialist, by the way) I just didn't have the time to do same. So I guess I'm one to blame for making people expect to get what they need without much effort.
If I actually used the time I spent on customizing people's portal for developing SimplePortal, we would have long released SimplePortal 3.0 and I'm pretty sure it would have had all those features built-in.
By the way, that above code will list members who has the group with the id of 12 as their additional group.