Moonshine’s first upload of his Mass Effect 2 mod was taken down by a DMCA notice, but he’s since re-uploaded the file, which you can find along with the installation instructions on his ME3 Explorer forum thread. Here are a few screenshots of Moonshine’s ME3 mod: Proving just how much people want the feature, after his laptop crashed Moonshine was able to raise about $625 (USD) on Indiegogo so he could get a new laptop and make the same mod for Mass Effect 1 & 3.
Here’s a demo of the mod by YouTuber gojeran: A small inconvenience for a badly needed feature. I’ve no way of testing the mod personally, but from what I understand the modded files will work with a variety of game controllers including the DualShock 4, it’s just that Moonshine’s UI will only display Xbox 360 buttons. As someone who’s never owned a Windows computer or any gaming computer for that matter, I was very surprised when I found out that the Mass Effect games for Windows never launched with and still don’t have native controller support. I know about it now only because ME3 Explorer forum member Moonshine released a mod for ME2 that adds the feature, including the appropriate UI.