One feature I would really like to see is if any changes are made where they were made and who made them. I seen this in a pharmacy software program and it was nice. It even contained the date and time and what the value was changed from and what it was changed to.
TimeTrex has a full log of all changes, though it doesn't specify what exactly was changed, just that a change occurred, who made it and at what time. However we don't have an interface to it just yet. This information is stored in the system_log table.