Actually, something like a "zotero for argparse" would be cool. Where you enter arguments, their type, help string, defaults etc in a gui and then you can check the ones you need for a given python script and copy the relevant python code into your paste buffer.

I don't think it would be a massive time saver however what I usually do now is find some previous script that had similar arguments and copy them, and then copy-paste-edit to add new arguments.

The other advantage is you could enter the arguments agnostically and export as whatever language you're working in.