I tried it and it really works! My backlinks thus reported by Google are fewer than those reported by Alltheweb, but more than those of a simple link:www.mydomain.com search.
Checking the query strings that Google uses for this "unabridged" backlinks search, I found them to be:
for all backlinks, including those from mydomain.com, and
for all external backlinks.
For comparison purposes, the query strings for Alltheweb regarding all, or only external backlinks, are