information efficient text enty using dasher

[openmoko at mauve.plus.com]

> <shamless_plug>
>
> Many fingerprint sensors that would fit where the button is have a
> navigation function.  They operate much like the touchstick, or a mini
> touchpad, when not capturing a fingerprint.  They are gaining traction in
> the tablet and ultra-mobile PC market for doing scrolling and simple
> navigation when a stylus is overkill for a certain quick navigation
> action.
>
> For example, this tablet has one on the top left (as pictured)
> http://www.tabletpc2.com/Review-FujitsuST5020-Article020605.htm
>
>
http://wiki.openmoko.org/wiki/Wish_List_-_Hardware#Finger_print_sensor