The Factorizer Manager allows you to add recipes to the factorizer.

To shorten method calls you can import the package like so:

ZenScript
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import mods.thermalexpansion.Factorizer;

You can add oneway split/combine recipes or two-way bindings.

ZenScript
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//mods.thermalexpansion.Factorizer.addRecipeSplit(IItemStack in, IItemStack out);
mods.thermalexpansion.Factorizer.addRecipeSplit(<minecraft:dirt>, <minecraft:grass> * 5);

//mods.thermalexpansion.Factorizer.addRecipeCombine(IItemStack in, IItemStack out);
mods.thermalexpansion.Factorizer.addRecipeCombine(<minecraft:grass> * 5, <minecraft:dirt>);

//mods.thermalexpansion.Factorizer.addRecipeBoth(IItemStack combined, IItemStack split);
mods.thermalexpansion.Factorizer.addRecipeBoth(<minecraft:trapped_chest>, <minecraft:chest> * 13);

You can of course also remove recipes.
If you want to remove a two-way binding you'll need two calls, though.

ZenScript
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//mods.thermalexpansion.Factorizer.removeRecipeSplit(IItemStack in);
mods.thermalexpansion.Factorizer.removeRecipeSplit(<minecraft:iron_block>);

//mods.thermalexpansion.Factorizer.removeRecipeCombine(IItemStack in);
mods.thermalexpansion.Factorizer.removeRecipeCombine(<minecraft:iron_ingot> * 9);