I took it from Ken Hood's Martial Art's system, and have not had any problems so far. It also keeps the monk more in the running for magic items as they don't have to wait for a +1 Kama to fall from the sky
To me its more of a flavor thing with the chosen weapons. A recent thread went into depth on the subject and the consensus was to use the stats of the core 'monk' weapons and simply call them whatever you want. Personally the idea of a Lucern Hammer wielding monk is just too cool to exclude
Eventually I will compile all my emails on the subject and put out my Eberron Monk Traditions in a more readable format to share..
The short version {from memory} is that Monk traditions started in two disparate cultures, one is the Dhakaani.. focused on field of battle combat and weapon mastery, and the Xendrik Elves.. a form learned in slavery where weapons were not available.
Over the years these styles have left thier original roots and are fairly available to a dedicated student at various schools about Khorvaire. The best are still 'old school' Dhakaani and Xendrik masters, altho getting training from then is difficult.
Dhakaani traditions tend towards hard forms, may wear medium armor and use a variety of combat weaponry.. Their use of the Inner Ki is stifled by this reliance on external support.
Xendrik traditions tend toward soft forms, refusing both armor and weapons in favor of strengthening thier Ki, often incorperating Psionics into thier art.
Of course, there exists blends of these extremes, such as the Dance of the Valenarian, with Ki focused along one particular weapon and the fabled Dim Mak of an ancient Goblin master.
