Timer slack for slacker developers

I have similar goals, but I'd like Wayland so that I could (do what is essentially) moving *windows* between X servers instead of having windows rooted in the $DISPLAY they started with. The xpra tool can sort of do it, but it's still rooted to some other display and AFAICT doesn't really give the full power of, say, XMonad (happy to be wrong though) over the xpra windows. Combine this with per-application freeze and thaw that came up a few weeks ago that works between different machines and I can migrate a running system to another machine :) .