manually indicate Requirements status

That's an interesting question. I can think of two approaches that might work.

1. Use SpiraTest as it was designed, but with the simplest possible test cases. Create one test case for each requirement. (It's easy to do on the main Requirement list with Tools -> Create Test Cases.) Then you'd have to put at least one test step in each test case so that you could run it. "Execute" each test case and choose pass, fail, caution, or blocked. You can even enter incidents and/or associate the test run with an existing incident. Then, on the project home page, the built-in "Requirements Coverage" bar graph will show the current status.

2. Don't use test cases at all. Then the test coverage field will be irrelevant, and you would use only the requirement "status" field. Right now, the list of potential statuses is fixed (requested, accepted, in progress, developed, tested, etc.) and may not be quite what you want. Also you'd need to customize the requirement workflow. Then, on the project home page, you could look at the built-in "Requirements Summary" table to see the current status.