Also, for the example of making fighters more complex in a module, in league with vancian casters, and not AEDU (I like it, the general consensus seems not to) is to use an already existing system - psionics. Monks called upon hidden resserves to do amazing stunts, why not fighters? Once again history/myth already shows us this. As a slight tweek with the 4E Psionics rules, make them endurance or fatigue points instead of PSPs. Novels are replete with the idea that fighters/warriors/etc, can get tired. Do away with per encounter/daily powers and just have a finite amount of points they can use per level. If the Ftr spends enough points to use it once and get tired out or use a bunch in short bursts, that's the Ftr's perogative while at the same time being more realistic.
Each of the Four Core would be balanced in power yet have different mechanics that DON'T break verisimulitude (sp?). They'd also have unique Class Features.
Mage = Vancian = Fire and Forget
Fighter = Manuevers = fight until you collapse from exhaustion
Cleric = Channel Divinity = pray and thou shalt recieve depending on deity
Rogue = Tricks based on Stat Specialization? I'm still a lil' foggy on this one but maybe DEX Rogue is like Disney's Aladdin evading the town guard in the opening seen, INT Rogue is like a master thief casing a vault to plan out the play (think Ocean's 11), while a CHA Rogue is like Bilbo Baggins sweet talking his way past Smaug the red dragon.