You can't change a units speed through triggers. The only units who can increase speed are Zealots, Zerglings, Hyrdralisk, Overlords, and Shuttles. Once they have been upgraded you cannot reset the upgrade.
The difference between the AL Scripts is SKill Level of the computer. You would have to test them out to see the difference.
As for hack protections, You can turn a queen into a doodad, causeing anyone who looks at it to crash. Or if you have to mine minerals, you can turn minerals into gas and if any players accumlates 499 minerals end scenario ( for zerg mineral hacks )
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