Mario & Mat,
I was aware of your work Mario on this and this idea is in part to complement it. I see your progress but not so clear on how to leverage it beyond the story.
My point here is a specific ui element following the existing tag pill. Unlike in Mat's proposal My idea was focused on "list fields" not just "list" but any field that contains a list, this would include the story list but more. I thoroughly support a filtered list pill, and can see how I may make what I need from that.
I have a large tiddlywiki running in a production environment, I used a consistent naming standard for anyname-list fields typically these lists fields contain a set of titles of existing tiddlers for example a list of Offices, a list of people both of these are what I call objects and have their own instances, object-type, view and edit templates etc... Then tiddlers can contain lists of these "objects", using a "field definition" method it would be trivial to identify fields used as lists and provide immediate access to list field handling.
A quick mock up (the labels default but can be changed)

The next step would be to permit the addition of items to the list from the pill.
Regards
Tony