How to get Applescript to trigger rapid fire keystrokes?

Hello all! Just made the switch from PC to Mac and loving it so far but there is one last key thing I need to get my set-up to be back to "normal". I have seen a few threads with the same question but the responses are quite frankly lacking in specifics and don't really resolve the issue (recommending apps that might solve the problem but provide no specifics as to how the script might be written in said program).

Here is the request:
I play games (notably World of Warcraft) where I have the need to have a key (1-6 number keys) repeat their signal (every 10th of a sec) when the key is pressed down, and stop when key is released. Additionally, I would like to have a toggle key (the \ key for example) that will toggle this functionality on an off while in the game (this way I can type prose without unintentionally spamming 11111 when I only want to press 1 once).

The reason why:
Games like World of Warcraft require crazy amounts of fast repetitive keystrokes. My wrists are not as young as they used to be and I am starting to feel the burn from just limited amounts of play. Allowing me to press and hold a key as opposed to spamming it as fast as humanly possible would help a LOT. Some PC users are familiar with AutoHotkey which can easily do what I am asking. I just need to believe that Applescript can do the same.

Are there any good scripters that can provide assistance?