The properties references are - for now - only available in properties files, not in JSP/XML/Java/... I'm currently actively working on that. IntelliJ marks 'jcr:title' as unresolved because it believes it is a nodetype. Both those issues will be fixed when I'm done with the properties references/completions, next release I hope ;)
A restart of the project is needed for the base CND files to be correctly loaded by IntelliJ the first time you open a project. I've recently fixed this in 86eed03188dc459d9f183b5d0e3dfaba78938d12, so this initial restart won't be necessary anymore in the next release.
Hello, I installed this plugin. I don't understand why Intellij doesn't find reference to native node and property. For instance :