After reading this GreenHopper Article we moved away from our bad habit of pointing sub-tasks. Since we log time for Capitalization purposes, doing time estimates isn't a good option. We moved to just doing a burndown on issue count. Unfortunately, this isn't supported. Is this somewhere in the pipeline? It was a feature of the classic boards, but I'm not finding a ticket for it in the backlog anywhere.
Issue count does not include sub tasks ;-(