I don't see why not, would just require everything to be coded again wouldn't it? Not my area of expertise, but I would think so.
Lol, put it like that and they definitely aren't implementing it. As far as I remember right now, they aren't changing anything that would break replays.
However a skip command would definitely would be useful. Most people would probably never use it though. It's much more satisfying to watch the entire replay.
Still ~Supported.
if anything, there should be a command to just /skip 342... /skip is to skip to the frame and the next set of numbers is obviously what frame you want to go to.