The only by-RAW way I know of to "sheath" a weapon as a free action would be Gloves of Storing/Gloves of the Master Strategist - but I'm not sure that would count for Iajutsu Focus =/
Oh well, if I can't avoid an AoO better make good use of it... Robilar's Gambit, here I come!
Just to be sure I'll check if there's some spell/power that does it and that I can craft into the scabbard.
Thanks anyway
Edit:
I was reading Karmic Strike, and it confuses me to no end so, while I'm sorry to ask 2 questions in a row, I must ask...
Q103: Karmic Strike doesn't state any exception to the rule of AoO that states "AoO resolve before the action that provoked them", while Robilar's Gambit does. That means that if you use the AoO you get to use Evasive Reflexes, Sidestep, Knockback (knockdown?), just kill the enemy or something similar then the damage is prevented? (as in: the weapons hits you but you stop it before it does actual damage)
I'm a bit confused since it talks about a "successful attack" but again, a successfull attack doesn't necessarily deal any damage.. it just hits.