There should be a feature where you can process the same recipe from the recipe map multiple times at once. So for example, let's say that you have a recipe where you turn a clay into a brick. In a machine with simultaneous processing, you would be able to put one clay, and it will turn into one brick. But you could also put 64 clay, and it will turn all 64 into bricks.

The closest comparison to this that I can think of would be something like the Tinkers' Smeltery. Or another example are the upgraded factories from Mekanism. Basically I just want some way of running the same recipe multiple times at the same time in a machine, to create large, parallelized versions of smaller machines.

GTCEu and I believe Modular Multiblocks CE also add a Parallelization component in their multiblocks.

However, if this gets implemented, we would need to toggle if parallel recipes of the same recipe should be enabled or not, and up to what integer amount of parallel recipes can be ran at once.

For now, can you try to experiment using specific blocks in your multiblock which enables the parallel recipe instead? IE: a "1x" block in the multiblock is a requirement for 1x recipes, a "4x" block for running 4x recipes (by multiplying the input/output/power) etc. You would end up making multiple recipes, but it's what should be possible until this gets implemented dynamically.