Alternate Magic system for Wizards

I've been thinking of wizard spells being affected by the specialization school of the wizard, rather than being a generic effect duplicated by every wizard who casts the spell. I'm working from the spell schools as defined in 3rd edition and later, though it could be applied to older versions of D&D as well. For example, Magic Missile effects would vary by the caster's focus:

• Abjuration: Target of each missile must save or be stunned for (caster level) rounds. Each missile above the first to hit a single target increases the save difficulty by 1.
• Conjuration: Caster chooses heavy darts or nets at the time of casting.
• Darts: Targets are hit for 1d4+1 damage per missile.
• Nets: Targets are entangled for (caster level) rounds. Each additional missile to hit a single target increases the duration of the entangled condition by 1 round.
• Divination: Targets are automatically hit for 5 damage for each missile.
• Enchantment: Target of each missile must be saved or be fascinated for (caster level) round. Each missile above the first to hit a single target increases the duration by 1 round.
• Evocation: choose fire or ice at time of casting. 
• Fire: Target must save or catch fire; each missile above the first to hit a single target increases the save difficulty by 1.
• Ice: Target must save or be slowed for (caster level) rounds. Each missile above the first to hit a single target increases the duration by 1 round.
• Illusion: Target must save or be struck unconscious. Each missile above the first to hit a single target increases the duration by 1.
• Necromancy: Target must save or have STR or CON (caster's choice) temporarily reduced by 2 for (caster level) rounds. Each additional missile adds 1 to the reduction, and 1 round to duration.
• Transmutation: Target must save or be transmogrified into a small, harmless animal (chicken, mouse, etc. - caster's choice) for (caster level) rounds. Each additional missile above the first to hit a single target increases the save difficulty by 1.
• In cases where a saving throw is required, a target that makes a save takes 2 damage per missile that hits instead.

This will obviously require some re-working of the wizard's spell list, to eliminate duplication of effects. Keep in mind not all spells will be usable by all wizard specialists.