I took a look at all of the shortcuts that Vimium offers, and beside the f/F to open the link, other shortcuts are already available natively in Chrome, like:

* arrow keys/PgUp/PgDn for scrolling

* Ctrl-PgUp/PgDn for switching tabs

* Home/End for top/bottom of page

* Ctrl-U for source

* Ctrl-L for switching to the omnibox

* etc

I guess some people might wince at the fact that they have to touch the arrow keys or Home/End/PgUp/PgDn, but my keyboard has those keys and I'm used to it.