[Feature Request] VIM Visual Mode for Selecting Manga

[Enoumy]

Is your feature request related to a problem? Please describe.
When wanting to read a lot of manga I end up using ctrl+E a lot (3 keystrokes per chapter).

Describe the solution you'd like
I'd like to do something like vim's visual mode to select. (e.g. Shift+v, and then move arrow keys up/down to move selection.)

Describe alternatives you've considered
Hmm, maybe also briefly thought about other non-vim keybindings like ctrl+space. Maybe the key that's used vi vs. emacs mode could be configurable?

Additional context
I am happy to implement this.

[darylhjd]

Feel free to implement this, but your implementation should not affect or change current behaviour.