I provided test project in it's initial state - so you can test:
clause (1) - add org.jboss.tools.jsf.jsfnature & org.jboss.tools.jst.web.kb.kbnature - manually - then closed the test project and reopen it - and yuu can navigate with tags;
clause (2) - use "Add JBoss Tools Knowledge Base support" - and see that navigation to tld files with Ctrl+Left mouse for test.jspx does not work.