Hi Chad,
Regarding being able to reply to messages in the Suggestion Box, I just corrected the security configuration so you can now reply. It was a configuration error, nothing more.
For code in replies when you use the Reply link at the bottom of the thread or the reply link on a thread message, I think you can still format code. Let me try it and see. :)
Get-Service wuauserv | Stop-Service
If this works then all you need to do in the reply view you use is surround your code block with [ code ] and [ /code ] (without the added spaces).