VS 2013 Git integration - customize compare with unmodified option?

Question

I am researching Git for VS 2013, and it seems pretty solid so far. However, it seems to be lacking customization options.

First question: With TFS and subversion (AnkhSVN) I am able to configure my own custom compare and merge tools (I am using CodeCompare, no affiliation, just a preference). Example for TFS:

There are no similar options with Git, even thought it's a Microsoft Git Provider. Am I missing a plugin?

Second question: I also could not find an option to do "Compare" with a double click. It is very unproductive to right-click and go to "Compare with unmodified" every time.

VS 2013 has a nice option to view only modified files, so I was going to use that + key or mouse combination (I've tried Shift-dblClick - no luck). Did anyone manage to discover such combination?

Answer 1

Trick at How to use an external diff tool for Git in Visual Studio 2013? has helped me to fix this issue.

    [diff]
    guitool = winmerge
        tool = winmerge

    [difftool "winmerge"]
        path = C:/Tools/WinMerge/WinMergeU.exe
        cmd = C:/Tools/WinMerge/WinMergeU.exe \"$LOCAL\" \"$REMOTE\"