It would be very nice if all users could have a to-do list for small things where you do not want to use milestones. This could be placed on every users dashboard. This way you could make your own to-do's and assign to-do's to other users in your group.

Deadline date? Link to task in gantt? Reorder and check completed to-do's? Optional email notification when reached deadline or received to-do from other user?

This would be a nice feature in my book! :)