Add a user scripts directory to the scripts search path

Every time Photoshop updates to a new version, I need to copy my scripts to the new version's scripts directory. Ideally, Photoshop would also check some other locations on the filesystem where user scripts might be located. For example, it could also check $HOME\Abobe\Photoshop\Scripts where $HOME is the user's home directory on their operating system and load scripts found their to the File  -> Scripts menu.