I've seen implementations of ACME's plumber as Emacs modes, I haven't seen implementations of Emacs in ACME.
ACME's plumber is very cool, and allows very easy customization of how some things work. Much easier than these things typically are in Emacs. But this behavior is implementable in Emacs (I wish it were standard), and lots of things that are hard-coded in ACME are fully customizable in Emacs.