Wow. Whoever designed that IGrip 'keyboard' thing should've thought that through better.
Besides, if you want a keyboard you can hold in your hand, a 'chording' arrangement would work better.
You can, with the right arrangement, fit the entire alphabet into 5 buttons. 6 buttons will get you capital letter and numbers.
7 will get you the entire basic ascii keyset...
With proper design, a device strapped to one hand could manage 7 buttons easy. (several more, 12+ if the person using it is dextrous enough).
Why bother? Well, it'd allow high-speed single-handed typing.
It'd look weird, and it wouldn't be much use for games (not a good layout, and not enough buttons for a PC), but it'd be great for mobile use.
That OCZ headset is like the poor cousin of the Emotiv Epoc headset. Which is a full 14 channel EEG system (and can be used as such by researchers) as a 'game controller' it has a bunch of specialised code that lets it detect aspects of your moods, facial expressions, and be used for 'mind control' (it's like having 4 buttons you can 'push' with thought alone. - It's got this weird quirk where it'll recognise up to 13 programmed actions, but you can only have 4 of them active at once or the system finds it too hard to tell them apart or something)
I've always been interested in trying an Epoc headset, but it'll probably be little more than a niche product forever.
Not only is what it can do for games limited, it takes a huge amount of training.
Most people wouldn't be willing to put up with hours of training the thing to recognise the thoughts associated with the actions you're trying to perform, so it's not likely to catch on regardless of how well it works after the fact.