It would be awesome to see that timetracking module released.
I was looking for a similar thing. As a "patch" I renamed the 'meeting' modules to be able to set a start and finish time. It's the only module that has that feature.
Is it possible to add that time notation to one of the other calender modules? Or, is there an easy way to just add a start-date to the ticket module. There is a deadline, but a start date would be great, so this module may be used for a weekly schedule. I've got a couple of employees who run servicehours on a weekly base, starting every monday. Using the ticketmodule I could set 52 tickets for this schedule, where every employee is planned per week. But in order to view this in the calender, either a start-date needs to be set, or the ticketdate must be viewed. Within these tickets, provided services, 'bugs' will be made for the worked hours.
It would be perfect if these hours could be transferred into an invoice module. I've installed the payments module, but must admit that I haven't found the screens of it yet. As of yet this isn't a big issue, but I'd like the system to be fully functional at the start of the new year.