This is an important feature other agile tools have and most useful for grouping stories, tasks. Theme or category is a way classifying stories and tasks
As an admin of project, i would like to specify themes at a project level
As a developer, I would like to associate one or more themes out of list of themes to stories and tasks
As a project manager, i would like to view stories or tasks by theme.
Are these just tags that you sort/filter by?