As of Mekanism 9.7.0 it is now possible to view all recipe strings of the Energized Smelter through the command /ct mekrecipes smelter

ZenScript
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mods.mekanism.smelter.addRecipe(IIngredient inputStack, IItemStack outputStack);

mods.mekanism.smelter.addRecipe(<minecraft:tallgrass:1>, <minecraft:deadbush>);

As of Mekanism 9.7.0 it is possible to use IIngredients as the inputStack instead of only IItemStacks.

Note: Currently all this does is loop over the different possibilities in java while adding instead of you having to do it in ZenScript. Currently there is no built in support for compound ingredients or oredictionary in the machines themselves.

ZenScript
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mods.mekanism.smelter.removeRecipe(IIngredient inputStack, @Optional IIngredient outputStack);

mods.mekanism.smelter.removeRecipe(<minecraft:sand:*>, <minecraft:glass>);
mods.mekanism.smelter.removeRecipe(<minecraft:cobblestone>);

Specifying an output parameter will only remove the specific recipe that results in that output from that input. Omitting the output parameter will remove all recipes that the input item can produce.

As of Mekanism 9.7.0 it is now possible to remove all Energized Smelter recipes. (This excludes any recipes added via CraftTweaker)

ZenScript
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mods.mekanism.smelter.removeAllRecipes();