Well the problem has always been that due to the way things like BAB and saves scale, the disparity at higher levels between good BAB and saves and bad BAB and saves becomes so great that you often either autofail or autosucceed. Now, if they make BAB and other attacks work more like the skills and saves in Saga, you could minimize this problem. They could give every character a set BAB progression that applies to all characters, then certain classes get bonuses at first level, like with saves. The only problem is you couldn't use the same multi-classing as Saga, since a bonus to BAB is far more valuable than a bonus to a single defense. Maybe something like you only get the bonuses from the class you have the most levels in. That would discourage Rogues dipping into a single level of Fighter for the attack bonus.