Critical - Record the ACTUAL time span of a task on the calendar w START & STOP times

Still waiting on this - this is critical -
One thing that I really wish could be added, especially in light of the new calendar and Milestones would be for each task scheduled for the future to be added to the calendar automatically in various color coded options - very similar to the Google calendar - also as a new task timer is started it automatically added the start time to the calendar and draws a color coded line for the time span when the timer is stopped.
Basically I want each aspect of Intervals not just to record the AMOUNT of time but the ACTUAL time span on the calendar that the task was performed in. The actual start and end time for each task should not be a big deal to add as I'm sure the data is already somewhere in the program.
Hope this is something you can do very soon!
Thanks. Craig.