File saving locations with FireFox

I was curious if anyone could help me out on this.
I recently did a clean sweep of my system drive and am keeping most things external for easier plug-n-play and swap capabilities.

Currently by default Firefox saves downloads to:
MacHD > Users > AppleNewton > Downloads

So i changed that to point to my external drive:
Volume > Downloads (folder on drive) > Firefox

so when i say goto apple.com and download programs or utilities it prompts the Okay to download and it saves it to that destination.
(since it does not auto-launch)

So my problem is those files that auto-launch another application say..iTunes, VLC or uTorrent.

I download torrent file, it saves the package to the Downloads section but within uTorrent I can send it to a different completed folder.

So i just need to find out a way to get the auto-launch files to be saved to the Firefox downloads folder on the external drive, isntead of defaulting to the MacHD>User>AppleNewton>Downloads folder

it seems to only do it when the item is selected as Open With when using Firefox.


hope that made sense


thanks!