Re: Ensuring that all tests have been used in your test plan.

Try creating an Excel report in the Dashboard module with this query

SELECT
  TS_TEST_ID,
  TS_NAME,
  TC_TEST_ID,
  TC_TESTCYCL_ID
FROM
  TEST
left JOIN TESTCYCL ON TESTCYCL.TC_TEST_ID = TEST.TS_TEST_ID
order by testcycl.tc_test_id, test.ts_test_id asc

 That will give you a list of all tests in the Test Plan, and each associated Test Instance in the Test Lab. If there is no associated Test Instance, then the TC_TEST_ID and TC_TESTCYCL_ID fields will be blank for those Tests.