I would like to see some enhancements to the graphs you can create with the dashboard designer. Specifically there is two things I miss:
1 - The ability to change the time range from the dashboard itself after it is published. Now it is locked to whatever time the creator decided.
2 - The ability to expand the graph. This could be done using the old performance-report graphs in flash or, and by far the preferred option, in a new HTML5 presentation. Also this pop-out should have the ability to change the time ranges in the same way as the performance-reports do today.
I guess it would also be nice to have the option to remove the grid behind the graphs but thats more of a cosmetic thing...