Both execution statuses at the Testcase and the Test Step level can be customized. By default, a testcase or a test step is in the "Unexecuted" or "Change Status" state before it can be put into one of 4 standard or system statuses - Pass, Fail, WIP (Work in Progress), and Blocked. System statuses can be modified (select it and click the "Edit" button) but not disabled.
Additional statuses can be easily added, color customized and enabled/disabled.
...