My StumpWM is heavily customized though, and I mostly modeled Jwno's behavior after my own config, so it may not be what you expected at all.
But that's one of the reasons I like Lisp and things built in Lisp: They are so flexible, you can sometimes build something based on the original thing, while it feels completely different from the original.
> my monitor seems just the right shape/resolution for the standard Windows splits to be suboptimal
Do you use an ultra-wide? In that case, Jwno has no OOTB ultra-wide support, but there's a section for adjusting it in the cookbook[1].
[1]: https://agent-kilo.github.io/jwno/cookbook/adjust-top-level-...