Ok, to allow only one pet per account, in inc > functions.php find:
PHP Code:
} // End the is there conditions if statement
Add after:
PHP Code:
$query = "SELECT * FROM ".$prefix."owned_adoptables WHERE owner='".$loggedinname."'";
$result = mysql_query($query);
$num = mysql_numrows($result);
if($num > 0){
$canadopt = "no";
}
As far as limiting the double level up situation, currently there's not really a way to prevent this. This isn't too big of an issue though because usually users only register one account. I can look into it though.
Also, as far as viewing the detailed info about who clicked what, you can do this in PHPMyAdmin by looking at the adopts_vote_voters table, which lists all votes by username or IP address and which adoptable they voted for.
Hope this helps,
Brandon