Speed up a section of a video

Hi!! Count me as someone wanting speed editing in Replay. I do a lot of screencast walk-throughs, and I don't want to actually trim out anything, I just need them to go faster, like when I'm selecting menu options or scrolling or when web pages are loading slowly.

Actually, Articulate should just completely copy the UX for Screencast-O-Matic. That's the best video editor I've ever used :-)