Comment on Aaron's blog.
Paivi Majaranta, Ulla-Kaija Ahola and Oleg Spakov were trying to find a way to increase the typing speed of those that use gaze typing. Gaze typing is a form of text entry where the user's eyes are tracked and registers a keystroke when they stare at a key for a predetermined amount of time. Because of this register time, this limits the typing speed of the users to 5-10 words per minute.
For their system, they allowed the user to adjust the gaze time required to register a stroke. They found that within one or two days, many of the participants were able to greatly reduce the gaze time and still maintain high accuracy in their typing. In this study, the grand mean of the typing speed went from 6.9 wpm to 19.89 wpm with little significant reduction in accuracy.
I think that for something like gaze typing, an adjustable dwell time is very important. The more the user uses it, the more proficient he or she will become. By allowing the user to adjust the dwell time, the user's ability is not limited by the hardware. This allows the user to function more efficiently.
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