Please think about adding to the Context Menu a Move to Top of Sprint and a Move to Bottom of Sprint options. 

Or possibly move items that are marked as Done to the bottom of the Sprint automatically?

The issue that I see is that on the Active Sprint Board items that are marked as Done are shown interspersed with items that are still in progress. To fix this issue and give users visibility into what is being worked currently, or needs to still be worked, I move items in the Sprint, on the Backlog View, to the bottom of the sprint. This becomes a little more tedious once you start to have a larger number of items in the Sprint.

Thanks,
Scott Mitchell