We're running both the 5.4.2 Perl and PHP versions of W3T at the Texas Offroad Network. With the modedit configuration variable enabled on both versions, I've notice the following differences that appear to be bugs in the PHP version.
1. In showoneuser.php on line 175, I believe the target should be "selectoption" instead of "showoneuser".
2. In showugroup.php line 22, moderators should be allowed. Replace the line with
if ($user[U_Status] != 'Administrator' && $user[U_Status] != 'Moderator'){
3. In showugroup.php, remove the single quotes from line 32.
4. In showugroup.php, a "continue" statement should be added before the closing curly brace at line 83. The Perl version has a "next" statement at this point. This change is of particular importance. Without the "continue", a moderator will be allowed to add another user (or himself!) to ANY group, not just the groups to which the moderator currently belongs.
We have subsequently turned off the modedit capabilities for other reasons. I thought I'd pass along this info for others.