I'm hoping to get the next update done by the end of the week. Here's my summary of what zebras are going to be like, with thanks to an Anon over on Ponychan for pointing me to some groovy legends:
Aziza Zebras: Based on African fairies, they live in forests, and thus have increased skill gains in hunting and wood-related skills. As the aziza are also the beings who gave man the gift of fire, aziza zebras gain skill in furnace related abilities quicker.
Ibis Zebras: Based on the ibis bird, considered sacred by the ancient Egyptians and believed to represent Thoth, these winged zebras are good at negotiation, organisation, record keeping, architectural skills and delicate crafting work. They are also great animal trappers and herbalists. While most Ibes are black and white, some are brilliant red.
Karkadann and Abada Zebras: Karkadann have one horn growing from their muzzle and outnumber Abada, who have two horns growing from their heads, two to one. Both known for their purity and the medicinal properties of their horns, they have higher than average ability in medical, dissection and farming skills, as well as cheese and soap making. Having two horns allows the Abada to focus two telekinetic waves at once, allowing it to wield two shields in addition to a weapon.
As far as is possible, I'll be making these mods modular. The only thing I'd say are requirements are the stripe patterns, because I'll use them wherever I please, but you'll be able to play with any one of or any mix of ponies, zebras, cave ponies and night mares(for the love of Celestia, give me a better name) you please, or even just add parasprites to make you draft every dorf in your fort to slaughter a storm of food eating, booze guzzling, psychotic balls of fluff every so often.