Given that it will most likely be too difficult to implement new animations to support 2WF with FoB, I would like to request the following implementation.
1) Flurry of Blows = 15% increase to attack speed, classified as sacred for appropriate stacking purposes. Implement FoB as a toggle and maintain the -2 attack bonus for using it.
2) At level 5, improve the toggle (call it something like Improved Flurry) and reduce the attack penalty to -1.
3) At level 9, improve the toggle such that the attack penalty is reduced to 0.
4) Greater Flurry = 30% increase to attack speed, classified as sacred.
Not sure about the actual percents as I don't have a tested attacks per minute for Kamas. I don't see how they will be able to implement unarmed strike as 2WF, so don't see that as an issue. This in turn will force the monk to make a choice: 1) the most possible attacks at lower base damage with Kama(s) or 2) additional, but less than maximum, attacks with higher base damage unarmed strikes.