When you add folder in NI Package Builder it add all the files included. It can be usefull to remove automatically somes files or folder with filters.
Just to give some examples. I have to include some Python Script. Python is generating *.pyc files in _pycache_ folder. If I have the ability to exclude automatically a list of extension file, or file/folder of list based on regular expressio, it can be very usefull.
My source code is under SVN source code control. When you selet a folder, it populates also hidden folder. So it adds my ".svn" folder.
Add ability to exclude hidden folder and have the first filter will help me better manage my files to distribute. This can be added to the propoerty page of the input folder.