It would be great to be able to create folders as smart folder, a bit like you can with calendars - but to include customer fields as well.
As an example, one of our uses of custom fields is for automation development - so we would like to use a Smart Folder to create - needs scoping, development, in production etc
Whilst we could use reports - these aren't practical for workload planning, we need the tasks within a folder and don't want to have to keep running filters and mass moving/copying tasks. We're big into automation!!