When I make a commit, I enjoy writing the commit message in an editor window containing a complete diff of my staged changes. I can do that from the terminal by running the command:

git commit --verbose

However, VSCode doesn't seem to support that commit mode out of the box. Perhaps it could be the fallback behavior if you run one of the Git: Commit commands and enter a blank commit message. (Currently, that fails silently.) Or better yet, how about a git.verboseCommit setting that, set to true, would make the Git: Commit commands take me directly to the verbose commit editor?