Julian Viereck created Skywriter/Ace's keybinding system with the requirement that it had to be able to handle Emacs and vi style keybindings. Those of us working the most on Skywriter were actually fine with the default bindings, but we looked up the different keybinding patterns used by Emacs and vi and made it possible to do those.

There's a bit of effort to go from that capability to a full set of bindings. I know that Gozala (on GitHub) worked a bit on vi bindings. For a motivated hacker, it's possible and likely not too much work to fit Ace with some slick bindings.