I know a conversation on an "Accelerometer-based mouse" occurred over a year ago, so I'm opening a new thread, but now that I am a few months into using the Twiddler 3 and am completely sold on the one-handed chordic typing approach, I want to second the gist of that request. The main drawback with the Twiddler for me is that the mouse almost unusable (it doesn't help that the joystick is not variable speed). For me it is either too fast to find a link, or too slow to get across a split-screen setup. I've tried vimium and other keyboard-only options to internet browsing, but web sites are designed for point and click, and I think I will always need to have a point-and-click tool, whether I like it or not. A variable-speed joystick is an acceptable fix, but I think a gyroscopic solution would be better. I agree with earlier comments from the "Accelerometer-based mouse" thread that the absolute position and distance travelled aren't important. I use the twiddler with my hands hanging at my sides, or in other positions, I don't want to need to feel like I'm pointing something at the screen, that is too restrictive. I also don't want to need to make sure my arm starts at level and measure the tilt from one side to the other, in fact, for my uses that might even be a deal breaker. I really think you could get away with a basic 3-axis gyroscope -- no accelerometers needed. All that needs to matter is the change in the angle from which I start using the mouse, which gyroscopes can capture. That means there would need to be some kind of trigger to say "listen to the gyroscopes now" which would level-set for cursor movement, and then any changes in the angle of the Twiddler while the trigger is depressed could control the direction and speed the cursor moves. So then, for example, if I want to set a change of 12 degrees to travel 1000 pixels, I could easily get anywhere around my screen nearly instantly, and could probably have enough precision to compare with the use of my mouse, especially one I get used to it.
There are a lot of non-chordic controllers out there for under $20 that use a gyroscope/accelerometer/other sensor approach to control a cursor, so I don't think it would cause a major change to the price point to include gyroscopes, and they draw very little power, but it would make a big difference for the use I get out of it. It could also simplify the design of the device by getting rid of the joystick, which seems to me like the piece that is most prone to damage (and is the least elegant). The joystick could be replaced by another button, that could act as the trigger, or be removed entirely, and holding down any other button(s) that register a continuous press could serve that function.
Just two cents from a customer. I'm open to any other thoughts or alternatives.