I know of the hack you are looking for. However, I STRONGLY recommend that you upgrade to UBB6 version 6.0.3; if you don't, people will think your board is warez.
Anyway, here's a copy of the hack (don't know if this was formally released; The author of this is Philipp.
Open the template "public_topic_page.pl" in notepad
Find:
sub topic_row {
and add after that:
my $this_img = $user_profile[20];
if ($this_img ne "") {
$this_img = qq(

);
} else {
$this_img = "";
}
Find:
$user_status
$member_number
and add after that:
$this_img
Done