We don't do any estimates based on time. All of our estimates/actuals are based on Story Points. So, when we start grooming our backlog we estimate all of our Story issues with a Story Point value. As those Stories get put into a Sprint we do task breakout. To accurately reflect partially completed Stories we assign Story Point values to the Sub-Task issues. The problem with this is that in the Chart Board and various Dashboard graphs, we can either have sizes on the Sub-Tasks or Stories, but not both due to cumulative rollup, but as far as I can find, the Rapidboard doesn't do that.
Any hints?