This is a gigantic feature request, but I think it would be awesome if (something like) vim-ledger were to behave something like vim-taskwarrior.
https://github.com/farseer90718/vim-taskwarrior
Now it's true that taskwarrior is a task manager, and ledger is an accounting system, but they both have a similar approach with text-files and a rich command-set. Have a look, and perhaps you'll see what I mean.