As the title suggests, the ability to add a checklist to a card that already exists in another card - “Copy Checklist From”
In my use case I would have a card of “Master Checklists” for common scenarios that need to be handled and monitored in the same way, with the same set of owners for each action.
Currently it seems that this can only be achieved by a lot of clicking and copy/pasting. Quite time consuming.