>I imagine there is a rationale for 'ZZ', but it's not readily
>apparent. (Something to do with C-z in DOS, or the end of the
>alphabet?)
'z' is already used, and the <shift> and <z> keys are adjacent on
Murrrcan keyboards, so you can easily just quit out of the editor in
almost a single hand-action.
I never liked ":wq", because you gotta do
depress <shift>
<:>
release <shift>
<w>
<q>
<enter>
instead of the nice, simple, easy bang-bang of
depress <shift>
<Z><Z>
and you're out. Releasing the <shift> key doesn't even count. :D
Even ':' requires either 2 hands, or a weirdly-contorted 1-handed op.