I can't figure out why - but when I have a file type set to Handlebars, the standard Sublime keyboard shortcut of CMD + Alt + . - which is the shortcut for Edit > Tag > Complete Tag does not function at all.
I've been able to verify this with a couple of people to ensure it's not just my environment, but I'm not sure what other info I can provide to debug.
I'm on Sublime 2.0.2 build 2221