Debugging sucks. Until Jetbrains do something about this issue, we'll probably have to live with hacks (a workable one is described on the issue page). So go bug them (get it?). Seriously though, upvote the issue, and maybe more interest will help move things along.
Auto-completion was pretty trivial though. Go to
/usr/lib/meteor/packages. While you're in the project settings, you'll probably want to exclude the
.meteor directory, which you can do in the Directories settings.
And if you haven't checked out Meteor, check it out right now.