Does Twiddler support two-handed chords?
If yes, does it require special software on the receiving computer, or would it work with eg my Android phone on Bluetooth, or some random public computer I need to use transiently? Does one device pair to the other and then the other acts as a unified keyboard, or does the receiving computer have to see two devices? How does it figure out joint chord timing, since the "grace period" to determine what to count as the chord has to be for "have both hands released all non bucky keys" not "has one hand released", and the bucky keys might be on one hand even when the chord is only right handed?
I was thinking of this for two reasons:
a. braille display / Perkins style input
(And yes, I'm partially blind. I currently use Android TalkBack braille keyboard; have considered getting a braille display, which would have Perkins style keys, but not sure about it. Input could be used with either braille or audio output from my screen reader, so it's a separate question. This would be most useful e.g. for use while walking around, taking notes in places I can't easily set up a proper keyboard, etc.)
A simple two handed layout that would be most familiar to blind people is: left hand index finger = dot 1, middle = dot 2, ring = dot 3, pinky = dot 7; right hand respectively dots 4,5,6,8. Zero to all of those can be pressed simultaneously to make one 8-dot braille cell.
Personal preference varies on whether to count all keys pressed before the last key released, or only the keys pressed within x ms of all keys released. Continuing to hold a dot key prohibits output — no "repeat while held" like on normal keyboard — since this is also how one pre-corrects typos (just fix the chord before full release).
Adaptive models for one handed typing usually have an extra quasi-space key (or overload a key for this), to mean "that was the left dots, next chord is the right dots" — i.e. inputting half the cell at a time rather than full cell at a time.
Plus separate combining bucky keys, with any dot combination, for space, control, alt/option, meta/windows/command, & shift. (And yes, space is used as a combining key, for braille & screen reader specific input, to not collide with the standard OS usages.)
Plus sometimes also separate scroll keys.
One could do it one handed using columns (eg left column only = left dot only, right only = right dot only, center with or without others = left and right dots), but would require getting used to.
One could maybe do it two handed on one device, like in TalkBack braille keyboard "screen away" mode. I don't know how comfortable that'd be on a Twiddler (I've not yet tried one).
b. Steno style input, requiring two handed chords
Don't personally know enough about this to say more than that it's a thing and would be interesting to have available.
So… would any of the above work? How? What requirements or caveats?