This is exciting! Sometimes I clone the “new journal” button, and do something similar to set up a kind. But if there were a sort of routine around how that happens, so that setting up a new kind is as easy as naming it and setting up something like its “archetype tiddler” – that would be amazing. (As it is, I end up doing lots of cloning, to get the fields for a given type already present… or using a dynamic table for the things that are structurally isomorphic. Shiraz dynamic tables are great for efficient creation/population of fields, just by toggling into edit mode, and adding data to the columns in question.)
I find my projects always move back and forth in a dialectic between:
(A) deepening the structure around clearly-defined types (authors, excerpts, definitions, classroom-sessions, quiz-questions, etc.), and finding ways to streamline database or table-like structure around these, and
(b) free-form exploration, miscellaneous notes and connections (the kind of thing an old-fashioned database could never do on the fly).
What’s fascinating to me is how often an idea that starts out as a free-form note (a tiddler about this or that speculative idea) eventually grows into what looks like a member of an emerging kind – if and when I devote more attention to it. 
-Springer