[FEATURE REQUEST] Shortcut to quick-open top files in the list in nvim plugin

- As you can see here, I have some files that I open frequently but toggle fff with "ff" shortcut then typing the file name or using arrow key up/down is a bit slow to me, I want to add some shortcuts to this so I can open it quickly
- This is a reallyyy small feature that I hope you can add it to fff because I dont want to add an entire plugin like snipe or harpoon just for this
- Maybe we can use it with Alt-key or Ctrl-key (already have with j/k), so we can open it quickly