Just wondering a little about these for Ki Techniques. If you're using one that is maintained does the user still take penalties to it after there normal amounts of attacks/defenses (including extras from techniques, etc) as normal or do they stay at the predetermined value no matter what?

I rule that predetermined Attack/Defense are FINAL rolls, hence yes, they gain no penalties nor bonuses from any source. And yes, this makes predetermined roll techniques awesomely powerful in the first 8-10 levels of experience...they tend to be rebalanced afterwards and by level 15+ they tend to fall little beyond the curve.