So I reached the point in my twiddler training where I'm no longer limited by finger muscles and encountering other physical limitations.
For now, I'm still using my twiddler on my personal computer, which doesn't have bluetooth capabilities, so it's tethered on USB, and the cable limits a bit how I can hold it. I ended up with the elbow rested on the desk and the forearm vertical, so the twiddler is horizontal with the joystick towards my face and the USB cable somewhat straight to the screen. The problem is that now the pressure on my elbow is getting uncomfortable (I guess I'm pinching a nerve or some blood vessel), so I'm looking for an other posture. Having trouble finding one on my own, I humbly ask you all for suggestions.
This topic made me also wonder about the dreaded RSI. Despite using my keyboard a lot over the last two decades, I don't seem to experience any sign of RSI, but I have a very non-standard way of typing, with no wrist movement but forearm movement instead, and low angle of finger movement, fingers almost straight, the palm staying low and hovering over the wristrest (if I had one).
The twiddler is much more constrained in terms of hand position, with fingers curled and movement much closer to the usual typing.
So are there any points to be careful about in order to avoid RSI?
Is there enough hindsight on extensive twiddler use to asses the risk?