I’d be cautious about making basic keys be shortcuts, unless you only ever run Mach 4 on the machine and nothing else. Otherwise, if you switch to any other program (ie Windows Explorer) and hit “A” you will invoke the shortcut, as Mach doesn’t have to be the “key” or “foreground” application – it consumes all keystrokes and interprets them. Just FYI! It’s better/easier to make Ctrl-A do the job if you use other apps.
Good point, I usually use Ctrl and/or shift in conjunction.
However, the arrow keys are already consumed for jogging, and I use those for editing text or Vcarve a lot, so I end up disabling the Mach4 keyboard plugin (via the keyboard icon in the windows taskbar) most of the time when I pull up another app on the same computer anyway.