Hello @lunixbochs,
thanks a lot for the wonderful plugin!
Recently I decided to finally abandon Emacs and returned back to (n)vim, but your plugin makes me enthusiastic to-revive usage of my ST3 licenses and get best of both worlds. 
I bet that (n)vim might have better plugins/completions, etc. for some stuff - eg. vim-go for Go language, while ST3 is strong(er) in some other fields like web technology (HTML, CSS, SASS etc.).
Caveats sections lists some currently problematic area, but I wonder, in general, is it possible/feasible to e.g. use both (n)vim/ST3 completion plugins at the same time without enabling/disabling ActualVim globally and/or locally?





(the second two I can work around in horrifying ways, like