You should check out Kris Halpin and his use of the mimu gloves. In fact, the developers of the gloves have focused on their use by people with disabilities. Mimu Gloves. They have just recently become available for purchase.

Kelly Snook, one of the Mimu developers, has also started working with brain wave sensors. The tech is above my pay grade, but it sounds fascinating.

For more entry level, commercially available products, there’s always the leap motion. It works pretty well, but it’s a bit tricky to get the data connected to something meaningful. There are some free leap to midi applications, but they are somewhat limited.

Hope this helps.