Enjoyed playing with this monk and have a few interesting suggestions:
1) A new ki pool skill with bonus to Hide in Shadows. Useful to scout and great for monks that invest invest more points to Detect Traps than Move\Hide
2) a new ki pool skill - Bladestop - monk is protected from first physical attack. Should be easy to implement - monk gets 100% slashing\piercing\crushing resistance but first enemy attack will dispell those protections (On-hit maybe?) If it's too powerful then it may be limited to slashing resistance only, still pretty cool.
3) a new ki pool skill - Silver Palm, first monk attack are considered as with +6 magic weapon. To hit through Improved Mantle. A high level skill of course.
4) Ki pool arrow is really weak, but may be improved by:
a) moving it to earlier levels. Really this skill is too weak to be later than Stunning Blow.
b) adding a deafening effect.
c) adding an aura cleansing effect. This way monk can attack immediately after using this skill or he can just shoot another ki arrow instead
d) adding a 20% chance to do double damage (a crit like effect)