[BRLTTY] Keypad bindings and copy buffer

[Lee Maschmeyer]

Using 6606 I tried this change. I'm afraid I don't like it one single
bit. I appreciate all Dave's work as always, but this one is just too
high a cost. Using grade 2, when I push the Advance button on this PAC
Mate display the slowness of the dots to respond is very annoying. I
push the button with my right hand while my left hand is on the dots
and the slowness is noticeable. I also wonder about its impact on
using whiz wheels though I didn't test it rigorously.

The delay isn't of any practical significance I suppose, especially if
you're as slow a reader as I am, but I don't like the way it feels. I
did an AB comparison, leaving the modified version installed while
using run-brltty to run the re-repaired version and I could tell the
difference.

Very sorry,

-- 

Lee Maschmeyer

"Never imagine yourself not to be otherwise than what it might appear
to others that what you were or might have been was not otherwise than
what you had been would have appeared to them to be otherwise."
     --Lewis Carroll