I sent an email to the developers of fleksy asking if they can port their keyboard on sailfish too but no one answered...
however i suppose could be quiet easy to port this kind of gestures on the maliit keyboad... or not?
here the sdk of fleksy: http://fleksy.com/sdkterms/

other ideas can be:
1) https://www.youtube.com/watch?v=RGQTaHGQ04Q
2) http://www.eglador.de/files/4e4f3394...e60d031-23.php
3) https://www.youtube.com/watch?v=K92SEppr6kY
4) here some other ideas: http://www.fastcompany.com/1700461/5...e-touch-typing