I just confirmed comment triggers are working fine on a clean install.
You can try removing the contents of your Data folder and git cloning the ColdFusion package again or doing a clean install again.
Anyway, as far as the coloring/theming goes, if you want to match the ColdFusion comment blocks, the scope in your theme file for comments should be:
and that it matches all comment.block.* scopes
but this will match only comment.block.* comments in text.html.cfm
Right now your theme is set to
which only matches comment.block in source.* files