In the past, I've written 1 or 2 Games that utilized Typing as primary component of game play. As I was multi-tasking between surfing the DB Forums, Coding iCon, and StoryBoarding DarkMORG Engine, an idea for a RPG Magic system materialized in my mind's eye.
What about a RPG Spell Casting System based on Typing Skill? The premise is simple. You type in phrases to cast spells. The faster and more accurate your typing, the more successful/powerful the spell. It would be a challenge of both memory and hand-eye coordination.
I would not expect players to memorize a book of Spells, therefore one would store their spells in a Grimore (notebook). To make things interesting, certain effects on your character could impair your ability to view your Grimore, to cast spells. For example, Sleepiness could blur text, Confusion could scramble cerain letters or order of words, etc.