I scroll full pages or with the mouse. But I'd really like to have a scroll marker. My not quite working attempt at one: https://greasyfork.org/en/scripts/20937-red-read-line

With that in working I wouldn't need smoothing much anymore and could scroll half pages without confusion.

I'm currently stuck to pentadactyl, would try vimperator again, but don't want to set it up. Would have to see how to port my pocket script and such.

Try giving VimFx a go. It's a Firefox port of Vimium. Has less features than Vimperator but doesn't alter the browser UI as much. It's also compatible with multiprocess Firefox.