As we know the monk benefits from the Two-Weapon Fighting (TWF) feats as normal. This is working the way it does in PnP. What I would like to suggest is the the Two-Weapon Defense (TWD) Feat(s) and Tempest PrE line be corrected to worlk as per the PnP rules as well.
A Monks unarmed attacks are considered to be both Natural and Manufactured weapons for all purposes (spells, feats, abilities). In PnP the TWD feats require that you weild two weapons to gain the benefits, Monk unarmed attacks fullfill this requirement just like for the TWF feats. The same holds true for the abilities granted bye the Tempest PrC in the PnP game. So why do they not grant their benefits in DDO?