We have 2 date custom fields called "Goal Start" & "Goal Due" to keep a record of the original targets, but it would be nice if we could link those two fields to each other so they would function more like the Start/Due Date fields.
This functionality would probably enable you to more easily allow date custom fields to be used in Gantt, Timeline, & Workload views (https://feedback.clickup.com/feature-requests/p/allow-custom-date-fields-to-replace-due-date-as-basis-for-gannt-timeline-and-wor).