Keyclone broadcasts every key pressed to every client.

You have the option of a white list (only broadcast certain keys), which I personally do not like.
Or the option of a black list (do not broadcast certain keys), which I find useful.
Also the Pause key (default keybind is Pause) is very useful.

The easiest set up, is to have a bunch of keybinds on your toons.
If you were to go with Shift A through Shift semi-colon (home row).
And Alt A through Alt semi-colon (home row).
And Ctrl A through Ctrl semi-colon (home row).
That's a lot of hot keys.

Then leave a keybind blank for a toon which you don't want anything to happen on a given press.
For example the healer might have heals on some keybinds.
But you want to control them separately.
So maybe Alt A through Alt Semi-Colon are healer keybinds.
And the tank/dps don't use these.
Or whatever.