Rather than creating a duplicate thread, I've moved this thread over to the Hacking section (and, I've deleted your duplicate post). Thanks for your understanding.
To answer your question, there are two tweaks that I am aware of: Safari Download Manager and Chrome Download Manager. I have Safari Download Manager and the folder you mentioned is the default location when you first go to download. However, you can also browse for a place to put your download (e.g. pick your own location). I don't know about Chrome Download Manager as I don't have that tweak.
Hope this helps.
Marilyn