Posey, the original inspiration for Faust's Fluttershy, started out as an earth pony in the pitch bible. The G1 Posey had the same color scheme as G4 Fluttershy ended up with. Faust was inspired by G1 Applejack, who has a similar color scheme to the final Applejack (but a completely different personality). Neither Faust's Fluttershy nor Applejack changed very much from the pitch bible, aside from Fluttershy's wings being added.
Not...really. You don't need to wish for it. Unicorns can at least do kinetic effects, and we usually have magic talents. My friend Rarity can do gem-seeking and some matter alterations. And it's not limited to unicorns, either...I know another pony, Zecora, who mastered magic through self-discipline and meditation. I think the hardest part was trying to make sure I could get myself and my friends from point A to point B, and that point B was a safe place. I remember one time I transported myself and Spike, and Spike got some burns...I put too much energy into the transit.