Allow additional arguments to curl?

I'd like to use plz to upload files to an authorized endpoint. That endpoint requires the file and various dynamically-assigned parameters to be passed as multipart form data. In curl this is achieved with command-line arguments like:

```sh
curl '' \
-F 'key=/users/1234/files/profile_pic.jpg' \

-F 'file=@my_local_file.jpg'
```
How would you feel about allowing an additional parameter `:additional-cli-args` (or something) that gets added to `curl-command-line-args`, or maybe just replaces `plz-curl-default-args`? This would allow me to use plz for such requests. What do you think?