Chording Keyboard for iPhone and Mac?

I've read that iPhone's virtual keyboard is not as bad as initially thought but I wonder if Apple will implement virtual version of Engelbart's 5-key chorded keyboard using multi-touch. If done right, users could just tap on the phone's glass surface with five fingers to type (fingers will have to be closer to each other due to lack of space but I don't see a major problem). I thought about hacking together a web-version but, according to iPhone developer docs, iPhone browser doesn't deliver multi-touch events to webapps.
For Macs, I think multi-touch mouse which Apple recently filed patent for might be used. 

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