Ability to limit a Trigger to contacts already on the Journey.
As a best practice we add contacts to a 'recieving' static list as the first action in a journey, then when it comes time to eject them, we have a smart segment that refines by the 'recieving' list + ejection criteria (sometimes for unsubscribe, sometimes for conversion, sometimes for disqualification, or external factors).
We also have to exclude this receiving list along with a master 'Ledger' list so that people who have entered in the past don't re-enter if we change Entry criteria.
All this said, We have a significant amount of setup, mostly so that we can ensure no contacts is added to the journey only for the sake of ejecting them.
This helps us make sure that Insight numbers are reliable.
What I am asking for is for an option on the smart segment trigger to 'limit to contacts already on this journey'
So that we can not have to create so many journey specific smart segments for managing journey participants.