On one of my tasks I set a start time, end time, and duration. Now I want to change the end time + duration, but its not allowing me. I'm not sure how the coding in the background is working but you should be able to lock one value (in this case start time) and adjust one of the two other numbers - the third number will obviously get calculated as a result.
So example: Lock task starting at 10:30 am, set duration equal to 4 hours, end time calculates as 2:30 pm.
Right now I cannot do this, it keeps adjusting the start time I think? and prehaps the end time is locked?