> dynamic layout rules and dynamic offset rules (important for ultrawide monitor users).
What is dynamic offset? And what are you missing from the existing layouts the existing dynamic WMs already deliver?
> and native support for Vimium-style shortcuts for every UI element on the screen (from jwno), but I could probably live without these.
Isn't this impossible with Linux, as the WM has no control over the application on that level? Maybe through accessibility-settings you can gain them on a per app-basis. But this seems more a problem of Desktop Environments than Window Managers.