Is it possible to create your own 'smart lists'? I find them very useful and would like to create some additional ones. For example, in addition to the built-in 'Planned' list, I would like an 'Unplanned' list that would include tasks that weren't on today's to-do list but needed immediate attention. This would allow me to see how much of my day is getting disrupted by things I wasn't expecting to have to work on.
