As of version 3.0.8, Mystical Agriculture allows you easily add your own Infusion Crafting recipes using CraftTweaker. Here's how you do it.
Adding a recipe
mods.mysticalagriculture.InfusionCrafting.addRecipe(name, <output>, [inputs]);
name: A unique name for this recipe. Must be all lower case and have no spaces.
output: The output item for this recipe.
inputs: An array of 1-9 items. The first item is the item that goes on the Infusion Altar, and the rest go on the pedestals.
mods.mysticalagriculture.InfusionCrafting.addRecipe("test", <item:minecraft:stick> * 10, [<item:minecraft:diamond>, <tag:forge:ingots/iron>, <item:minecraft:stick>]);
output: The item to remove all recipes for.