Go for it.
If the perogative for airline captains to have the last word on approval for someone to occupy the jump seat has been removed then the locking of the flight deck door is giving in to a repressive system that wants to close ALL stable doors.
In times of low activity I much enjoyed having a young fellow in the jump seat providing an introduction to the complexity of the environment. It was also a boost for CRM.
How many of the current captains made their decision to become one after their first time in a jump seat?