This might be interesting for devs using this engine. I noticed some people experimenting with splats in pbta titles and decided to explain the idea alongside some pros and cons that I noticed.
https://fngsite.wordpress.com/2016/06/10/can-you-do-splats-in-a-powered-by-the-apocalypse-game/
though it does it for very different reasons, Battle Between the Worlds/Space Wurm vs. Moonicorn does some of the mechanical things you’re talking about: different stats for each character and characters that have different basic moves.
To do it, do it, son!
That could be interesting. You could just go the traditional route and take each playbook and give it a splat. For example, a whole book dedicated to the Driver with more move choices more stuff on vehicles, maybe alternate vehicle rules etc. Maybe an extra playbook that is meant to be used for the “change your character to a new playbook move” for Drivers only. Advice on playing the Driver. Analysis on Drivers in fiction. Stuff like that. Just Driver, Driver, Driver.
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Robert Burson That’s a really interesting idea, in it’s own right. It could run into the issuse, of course, of bloat and that it might ignore that one of the best elements of pbta is the limits it imposes. That said, I can see this working out well for Dungeon World more than other pbta titles. DW is already less pbta than other pbta due to its earliness and the D&D elements, but also there is so much inspiration both in fiction and in games to make such splats as fantasy is the biggest trpg genre. It could be an interesting design experiment, if nothing else: can you add all this and not detract from what makes pbta good?