When a Warforged Monk heals himself with Fists of Light or Healing Ki, he takes the -50% penalty for divine healing due to being a Living Construct.
That should be removed, and warforged should get full benefit from monk healing. After all, compare it to Paladins- the DDO version of Paladins' Lay On Hands was modified to have 100% effectiveness on Warforged.
Monks are even less like a divine spellcaster than Paladins are, and thus they should have full repair-equivalency with their healing abilities, for both game balance and thematic flavor reasons.
PS. Here is an alternative way to address the above problem: At the levels where a WF monk would gain poison or disease immunity as a class feature, he instead gains a +25% boost to divine healing, which does not stack with the Healer's Friend enhancement (and which disqualifies him from that enhancement in the future)