I love the way I can use alt-G alt-D to instantly diff a file and navigate to the relevant sections. However, I use the submodules feature of git, and when I want to diff a file inside a submodule it always diffs it from the top level and so stops at the beginning of the submodule so I can't get a diff. In this case I still have to use an external Git client.

It would be a tremendous help if instead of running Git from the top level, you CD into the relevant directory and then call Git. That way Git will recognize that it's inside a submodule and give me the correct diff.