There is a way to have your content be easily portable. I am not sure back compatibile from PP2014 this is.

Make a folder for the product.  In it put  the Library file(s), OBJ, PMD, INJ/REM poses, add0n props and their components.  Material poses (Mat) in a subfolder and Textures in a subfolder of Mat.

Edit the pahs to be as short as possible.  For the geometry it is :.obj  - for the morphs =  :.pmd,   - for the textures = ":Mat:texturefoldername:_.jpg"

I have found that when using minimal paths, a Mat pose does not like finding a parallel folder. It is OK with going further out a branch, but not so much back to the trunk.

Everything is organized and easy to find. 

The folder can be in any Library, but if the extension does not match, double click or drag/drop? is necessary.

There is no thumbnail for a folder.

Editing the paths can be streamlined by using PhilC PZ3editor.  It has a batch plugin which will FIND/REPLACE a path in a whole folder of files at one click.  Just make sure that any PMD files are temporarily parked somewhere else while doing this.

You can have a storage Runtime and an active Runtime and COPY in the folders you are using.   With very short paths, which Runtime does not matter.