Out of curiosity I put some additional jars in a subfolder of the additionallibraries folder and accessed them using:
#AdditionalJar: nitrite\nitrite-3.4.3
While this works and I am happy doing it, I want to ask the question to check that it is not likely to break anything else either now or in the future before I go and tidy all of the additional jars. Which will leave the root of my additional libraries folder in a far more comprehensible state with only actual libraries minus the hundreds of additional jars I have played with over the years.