Cancelling an emote

[ZunaSW]

Hrm, I do not know if the title is enough to have a view of the idea, but here it is, I would like to know if it is possible to do this.
My plan is to write a slash command in the chat, an emote is played, and in X time the emote is cancelled. I looked if there was a function that could cancel emotes, but I couldn't find one, so I thought of using the shift key.
When Shift key is pressed, automatically the emote is cancelled (shift or the key you have for sprinting).

Is there any way to make the key be pressed when you write a slash command in the chat after a few moments without actually press the key?

Would be something like: Write slash command->few seconds->key pressed automatically.

I've been looking in the wiki for something for the key, but I can't find anything