A Toe Mouse was developed for the disabled, but how useful is it?
A study showed that the amount of people that have disabled arms/hands while having full mobility with their lower limbs is very low, and the number of customized devices for disabled operation already designed makes companies not want to develop products like this much further, yet alone produce and have them available for mass consumer purchase.
Secondly, unlike fingers, the ability to move one toe without moving the other is extremely difficult. As such, likeliness of clicking both toe-buttons at once would occur more often than not. Lastly, mobility with the foot/toe is much less than that of your hand/fingers, so I can only imagine how long it would take to scroll across a screen with this thing.
Overall? Nice idea, but unfortunately the operation of this new device makes the usage near impossible.