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.