yes, I understand
Tiddlers need not even remain in the story.
when designing my own focus tiddler I realised we can use multiple synonyms for focus, even simultaneously would be useful such as;
focused
selected
nominated
working
targeted
coding
use a thesaurus 
I also made a tool in the past to nominate tiddlers with an alphabetic letter A B C ETC… which allowed quick switch, very helpful when researching and coding across multiple tiddlers. it can be done without touching the tiddlers.
- this makes me think of a no touch tagging system
- to avoid conflict perhaps I call it flagging?