Take for instance the diamond mind maneuvers which let you sub concentration checks in place of saves. Most of the time, this would be sufficient in letting you make a save, assuming you don't roll abysmally low. Steady concentration removes all the downside risks by allowing you to take 10 on concentration checks. Barring some extreme scenarios, this should be enough to let you automatically succeed at any save.
How useful/viable is it in general to build a martial adept around the concept of accepting fixed die results (or being able to reroll crappy results) over relying on the most fickle of women - lady luck? Sure, I can never enjoy the upside benefits of rolling that natural 20, but I will never have to contend with the downsides of rolling low either.
Likewise, quite a number of maneuvers are practically all-or-nothing. For example, diamond blade nightmare either lets me deal 4xdamage only if I succeed on a concentration check and attack roll, and nothing if I fail. Since standard action maneuvers effectively allow me just 1 attack/round, it makes sense to want to maximize this 1 attack as much as possible.
For instance, I am contemplating a warblade who will take steady concentration at 6th lv, and find some way of qualifying for aura of absolute law (the stance which lets you take 11 on rolls) at 12th lv. If taking 11 on an attack roll is not enough to hit his AC, I would use lightning recovery to initiate a reroll and roll normally.
I am torn between dual stance (aura of law+stance of alacrity) or weapon supremacy at lv20 though.
I will stop shy of mentioning how it would allow me to power attack for the precise amount every time, because that would be blatant metagaming (and it is not too difficult to adjust a monster's AC via legitimate means).
Is this workable? How do you think it will fare in actual gameplay (I won't know since this is just a theoretical concept at the moment). Might it run the risk of becoming too boring since I will always know with near-absolute certainty how I will fare in challenges? Likewise, my DM will know that I can never fail a save, which can be irritating.
Also, what other ways are there of fixing your die rolls or rerolling them?