Zakharra wrote: Also, doesn't sign language use one letter at a time? If so, wouldn't it actually be faster to type it out rather than sign? At least with a keyboard, it knows when you move onto a new letter, a computer program might have to have you hold the letter/word for a moment to identify it otherwise it might get confused to what you are saying if your hands/fingers never stop moving.
No... some signs in ASL are meant to convey entire words or even common phrases or sentences. Usually one-letter-at-a-time signing is because you are unfamiliar with the shortcut sign for a phrase. However, remember that when learning to read and write, pretty much everyone starts out by learning the alphabet, one letter at a time. So while people learning to sign may *start* with signing one letter at a time, they quickly get into the habit of using the shortcut signs.
Some people who have autism respond better to signing than to written or spoken communication - my middle son is one of these, so I know a few shortcut signs that work well with him.