Can I rewrite URI/URL/sourceurl ?

[librix]

when I want to save the twitter pic, his url is

https://pbs.twimg.com/media/EQEN6n3UYAAjhH1?format=jpg&name=small

but the real url which I want to download is

https://pbs.twimg.com/media/EQEN6n3UYAAjhH1.jpg?name=orig

Can I rewrite the first download link to to the second one ?

I only see :sourceurl: varible, but it seems a read only varible.

[gyng]

Unfortunately, this is not supported now. Even though it's technically possible, it won't be supported anytime soon either as there's a bunch of cleanup I need to do before this can be implemented cleanly.