When responding to potential answers I sometimes like to include a code block to clarify what I'm talking about. Is it possible to have clean code-formatting in comments or only in questions and answers?
Comments, by design, are intended to convey brevity. If you have a code-block that you need to bring attention to, append onto your original post beneath a title like Update #2, and then reference it from within a comment if you need to.
If you have small inline examples, you can just wrap them in back-ticks `
var foo = bar.
Yea this is possible. See this answer.