Hello, I would like to get more information about your setup. Main PC has a shared drive (with files) attached to all 30 PC's? If yes, why do they have to copy files on their PC's to work. Is it not supported by the photoshop tools? There can be different ways to make it easier for end users. One good solution could be to have these tools installed on a server and publish, end users will access it using a website and all the processing will be done by the server. It will keep your data on the same repository and users will not need to move files back and forth. But it all depends how your environment is setup. Let me know if you want to discuss the solutions further.
Regards,
Zeeshan Amjad