It is good to have at least one standard 'sandbox' library folder for scripting purposes. It allows you to write temp versions of library files without having to ask the user every time where to write them with the risk they give different names or to have to pass path names between scripts. The standard press and temp folders are hidden pretty deep and Poser does not allow you to add folders to the library. A standard scratch/temp/dump space like this is a good alternative.