Yes!
This would be amazing! Obviously some toggle abilities wouldn't be included, like those to do with focus and those that potentially break the game (eg maybe archer won't get a toggle on leaping shot, but Hunter still could). And of course, all of the new abilities since May wouldn't have a toggle (which is fine, frankly, as they're all balanced around MP anyway. And it's not like you can use both upgrades at once). But this is definitely something that will drastically improve the game, and all they have to do is import 80% of it from singleplayer, and do a bit of balancing
I'm especially looking forward to Wall of Flame, Wisps of the Fallen (Spirit Mark) and Terror (Horror) :3