I don't know, that just seems to me to defeat the purpose of having a touchscreen. I've tried to use those mobile VNC clients and the experience is really bad. It's something I would use if I really had to access some important files on my desktop, but I wouldn't try to log in to my desktop with a mobile VNC client every day just to do work.
The best case with a desktop-like environment like sxmo is to just reuse the touchscreen digitizer as a plain old touchpad, with some tweak for other gestures (e.g. tap for clicking, double tap for dragging). AIUI, this is how mobile clients for VNC and RDP work already, so enabling this on the mobile desktop itself would be quite straightforward.