Do these not exist? I found it so handy using Lyx for a project recently, to be able to quickly keyboard-navigate and accept/reject, with no mouse involvement. For one thing, Google Docs' navigation here is a bit cumbersome (Ctrl+Alt+N,C, really?), but then I could not find any way to accept/reject.
Does everyone do such repetitive work all with the mouse, or is there some solution or plugin to enable a keyboard-centric workflow here?