The numbers are intrinsically tied into the mechanics, though. Like UK says, you can probably "fix" things but you're left with something that doesn't look like 3e anymore. For example, just about all monster numbers are based off of HD. Monster HD scales faster than party level, in such a way that monsters "work" at lower levels and then "break" as party level increases. You could change the calculations so that the numbers are based off of CR instead (this is basically what 4e did), but that doesn't work either since the upper CRs aren't correct. And either way you're left re-designing monsters from the ground up, and pretty much re-writing the monster books. You might as well be playing a different game at that point.See, a lot of what breaks the system is not the spells and powers and classes themselves, but the numbers behind them. That's a lot of what 4E did - they changed the numbers: BAB and saves scale at 1/2 levels, attacks and saves work differently (different DCs), etc. What Paizo did, changing grapple from an opposed roll to a roll against a static DC, altered it it drastically and made it actually WORK. I firmly believe that once you fix the numbers behind the mechanics, everything else will fall into place.
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