How do I prevent TGZ archives from being automatically un-gzipped upon download? I use Safari on Mac OS Lion, and one behavior I find rather annoying is that it insists on automatically un-gzipping TGZ archives when I download them. It doesn't untar them; it just uncompresses them, which is virtually useless. Ideally, it wouldn't uncompress them at all, but if it would uncompress and untar them I could live with that.

I'm aware that I can uncheck the "Open 'safe' files after downloading" option in Safari to false, but that also means giving up such niceties as PDFs automatically opening when I download them. Is there a more tailored solution?
Uncheck the, "Open "safe" files after downloading" checkbox in Safari's General preferences.