[quote=@Divinity]
[@MelonHead]I particularly agree with Preps being allowed to be 'strong hints', rather than a complete mapping of its effects and intentions. 

Balancing is important, but wouldn't a faster moving object also have more energy(assuming it also had decent mass) and therefore more power? Speed sacrifices maneuverability(particularly for characters, since laws of motion apply) if anything. I could agree that something becoming harder therefore becomes less flexible and such, though.
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I meant speed in an abstract form, though in physics terms an object of smaller mass can be moved 'quicker' because it requires less energy to overcome inertia, I suppose 'agility' would be a better term. Take a gun for an example, the bullet is an effective projectile because its small and aerodynamic with low mass which means with relatively little energy it can be propelled at great speed and still cause significant damage. The cannon ball does far more damage, but it's slower, not to mention far more unwieldy to walk around with.

Still, it's more of a balancing thing, otherwise everyone would just walk around with rail-guns. 

Point is, if you're generating an attack either with magic or physical means, larger projectiles are harder to get going but cause more damage when they get there. Statistics are useful for quantifying that sort of thing.