ModTweaker allows you to add or remove forestry Still Recipes

You can call the package using mods.forestry.Still

ZenScript
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//mods.forestry.Still.removeRecipe(ILiquidStack output, @Optional ILiquidStack fluidInput);
mods.forestry.Still.removeRecipe(<liquid:bio.ethanol>);
mods.forestry.Still.removeRecipe(<liquid:refinedcanolaoil>,<liquid:canolaoil>);
ZenScript
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//mods.forestry.Still.addRecipe(ILiquidStack fluidOutput, ILiquidStack fluidInput, int timePerUnit);
mods.forestry.Still.addRecipe(<liquid:lava>, <liquid:water>, 200);