on the alternate page where it displays your total health, mana, and armor, etc...

is there a line of code you could add in that would display each characters +defense stats? Because this would make it easier for us to view who has more defense when choosing a main tank for raids.

Thanks in advanced

This is possible, at least in theory. The pages you want to edit are indexstat.php and memberslist.php. In the main query, you have to join in the roster_skills table on member_id the same as the one from members, skill_type = weapon skills and skill_name = defense. Then skill_level should contain the defense:max defense skill.
You can then add that field to the indexstat.php. Check the other examples in index.php and indexstat.php and the description for field definitions in memberslist.php.

The main thing I'm not sure about here is if item skill bonuses are taken in account for the values of that table. If they aren't you're gonna have to write a value function that adds the bonuses.