Currently, when we add field updates to the DC event layout, dependent picklist is not being respected which would cause users to pick different options for the dependent list and ending up entering wrong data for the records. So, I would request the team to look into this and provide us with solution to display dependent picklists with the standard behavior.
What is the underlying problem do you intend to solve with this idea?
User's ending up entering wrong data for which the master list is not related
How is the problem being addressed today, if at all?