Is there a way to check slashing?

[Novice]

Well, I want to disable the slashing+a bug that allows you to slash while practically moving, and I've been able to, but players can change what their slashing key is. I don't know if there's a way already, but can you check if the player is currently slashing, like slashing=true; or so?
Or can you check what the player's slashing key is set to?

[Chompy]

I think keydown(4) is true when the slashing key is held down.