I have posted three times in SQA so far, and have really missed the Syntax Highlighting of StackOverflow for code. Is this really not possible?
It should be possible.
There's can be combo box on the Tag Wiki page (visible only to moderators) that allows you to indicate which syntax highlighting rules should be used for code in that tag.
You can also use the hints defined in this Meta Stack Overflow answer:
<!-- language: lang-or-tag-here --> code goes here
If this doesn't work or the "Code Language" drop down isn't there then your moderators need to request that the feature is enabled.