Thanks oBFusCATed, I knew CB had the feature somewhere.
On a related issue, syntax highlighting & comment handling works fine for the mm extension automatically.
Using Settings -> Editor -> Syntax Highlighting, and then selecting a file type from the "Syntax highlighting for:" drop-down (to select a profile; Bash in my case), I was able to add my own file type (*.awk) to the list by clicking the <Filemasks...> button and editing the mask.
Very nice.