Inscriber

ZenScript
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import mods.appliedenergistics2.Inscriber;

When the inscribe boolean is true, the top and bottom inputs are not consumed.

ZenScript
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Inscriber.addRecipe(IItemStack output, IItemStack input, boolean inscribe, @Optional IItemStack topInput, @Optional IItemStack bottomInput);

//turns eggs into Wither Skele spawn eggs, does not consume wither skull
Inscriber.addRecipe(<minecraft:spawn_egg:5>, <minecraft:egg>, true, <minecraft:skull:1>);

//combines bread, coco beans, and sugar. all inputs are consumed
Inscriber.addRecipe(<minecraft:cookie>, <minecraft:minecraft:bread>, false, <minecraft:dye:3>, <minecraft:sugar>);

ZenScript
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Inscriber.removeRecipe(IItemStack output);

//removes printed silicon recipe 
Inscriber.removeRecipe(<appliedenergistics2:material:20>);