Thanks for your reply.
I'd like to be able to take an output generated in Galaxy and copy or symlink it to somewhere in the file system with a meaningful name and extension.
This is a reasonable thing to do. Unfortunately, we don't have support for this right now. However, we're developing a web-based Galaxy API that will include this type of functionality.
Maybe the physical (.DAT) file path could be visible in the 'Edit properties' screen?
This doesn't make sense in many use cases, so I don't think we'll be adding as a default. However, it might make sense either on per-user or per-instance basis. If you add this or something similar to your Galaxy instance, feel free to send us a patch and we'll take a look at it and perhaps integrate it into the code base. Best, J.