I think that the whole swiping idea for swiping onto desktops would be hard to achieve (I don't have any idea, but it's what it seems to me).
Maybe the easiest way to develop it could be an application in the background that can be opened with shortcutd or with an icon that we can put in every desktop (I don't like the latter too). Maybe it could be a status menu app, but I think it isn't the best option either.
What I really liked was the screenshot thing, said before by other user here (don't have the name of the author now). The desktop selector app running in the background would take screenshots of every desktop when called. It isn't as wonderful and good looking as the task selector, which is alive, but don't think we could never get that. Who knows.
It would be great to have this feature in the future

Thanks to all the community and specially for the CSSU team.