Timeline based on start or end date and a time estimate

Hello,

When I prepare a task, I need to enter a timeline and a time estimate. Sadly, both are not linked together.
I would prefer to enter either the start date or the end date, the time estimate to realize the task and get the timeline calculated automatically based on the start/end date and the time estimate.

With such an automated timeline definition, we could also integrate much easier the management of employees vacations: the timeline could integrate the vacation period and postpone the end date or start date depending on the initial criteria.

This suggestion can be linked to the following about User presence management: Board user presence management

Thanks for any input and I hope this will catch your attention.