It seems as though your problem would be best solved by using one of the many systems that use non-vancian magic.

Anonymous 2010/07/17(Sat)13:19 No. 4031 ID: 383547
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Fuck anyone who says it's "too sciency."

Fantasy can have just as much Science as it damn well pleases.

Pic related. The Witcher has heavy implications of there being genetics in the setting that actually function somewhat like real genetics.

I've seen the vancian wiz/sor spell list changed to model the psionics system, it looked pretty good.

I've used psionics to replace sorcerers, but somehow I like the arbitrary weirdness of the vancian system for wizards.

One of my friends always forces the use of Spell Points from Unearthed Arcana, I think, when he DMs 3.5. As for Psionics, I just think of it as a different kind of Magic. Divine casters take energy from some greater power and channel that, Arcane casters use the energy of the world around them, and Psions use their own personal energy. At least, that's the way I think of it so I can blissfully ignore how the flavor is different.