Get a trial of IS Boxer.
That's seven days to try it out.

The wizard will generate a number of mapped keys for you.
1, 2, 3, 4, 5, 6, 7, 8, 9, 0, -, and = will all be FTL DPS Keys.
Meaning, from any window, press that key and they all will press whatever is on the keybind, but assist the active window first.

FTL stands for assisting that is not based on Focus, Target or Leader.
You can set that up with Keyclone, via Hotstrings, but the process is rather complicated.

IS Boxer does FTL for you.
It has instant window swaps between toons.
It has accurate mouse broadcasting in real time.

There are two "broadcast" modes.
Broadcasting (the Keyclone term) is the same as Repeater (the IS Boxer term).
IS Boxer also has mapped keys, which are keys with hotkeys that do whatever.
You can have both on, both off, or either on and the other off.
It's a little different from Keyclone, but far more powerful.

If both Keymaps and Repeater are on, Keymaps have priority.
You'd want Keymaps on, and Repeater off for 99% of your in-game play.
Repeater on, and Keymaps off, for entering your passwords or for everyone to /dance or type /macro in game.
Both on, to briefly click something with the mouse.
Both off, to chat with a single toon either via whisper or /bg /raid chat.