Just as the title states, I think it would be a great value add to the Desktop core products if you could see python files in the contents window of ArcCatalog. Not scripts in a toolbox, rather scripts just in a folder workspace.
You could then open/edit them in the Python window that's already built into the software.
If I have a python script or code snippet, I have to open the file in IDLE or another editor and copy/paste the script into the python window. Unless I am missing something in the settings to see other files in the Contents window, having this functionality really just makes sense.