The ability to add more than one recipe to an image would be great. I often use one recipe but then have to exit the NIK (CEP4 or SE2) to then add another recipe on top of the previous one which means an additional round trip through Lightroom and an extra TIFF.
Would be great if could stack more than one recipe on top of another (similar to adding filters) and re-order them and adjust / fine tune any filter within the recipe without doing as a two or even three round trip process.