Middle click in Visual Studio Code for scrolling?

Since the issue has been reported but not fixed for 5 years, you should upvote that issue, and then use the autohotkey workaround:

https://github.com/qooqu/vs-code-mbutton-scroll-ahk

(You have to hold the middle-button down in vscode and drag the mouse up or down to autoscroll, and it scrolls one line at a time instead of smoothly, but it's much better than nothing.)

(To use: Install AutoHotkey, then you can download and run the linked .ahk file)

No, unfortunately not (yet). But you can contribute here on github to make it happen.