It would be great to be able to filter the report by a time window, especially for reporting. Or being able to use it to zoom in on a part of a plan. For instance I would like to be able to find out what percentage of effort was spent on themes for a certain time window (like Q1, Q2, etc).

There are two hacks I can think of:
-Add a release to all streams and assign anything that starts in Q1 to that release. Then do reporting by the release.

-Label initiatives with a prefix (like Q1-Go to Moon) and then filter by that prefix.

Both of these are really approximate as releases or initiatives bleed into Q2 from Q1.

Or is there another way to do this?