That one is the only default script path I'm aware of.StoryCave wrote: Is there a universal default script folder path line I could use across both PCs and MACs ? like this one : .../Photoshop CC 2015/Presets/ Scripts
Which is version dependent, so I'm afraid you always need to perform some maintenance when new versions appear. What has been suggested in the past, is to keep your script sources in a single folder (where you find it more convenient) and alias that folder in the various Presets/Scripts.
Mind you, Adobe is now suggesting to deploy filters in a shared, from CC-onwards location. So plugins have a truly version-independent folder. That's not the case of Scripting, you can add a feature request for that!
Davide