PLEASE make the task reminder field smarter.

Current set up:

• won't let you close an activity if reminder date is past due - this is crazy coz if you are closing a task there is no need for the reminder
• does not add a default reminder date - i can live with that but would be nice to have it set to Task Date (even just a "remind when due" checkbox would be nice)
  
• doesn't change Reminder Date if if you change the Task Date - reminder Date should also change