You could just bind a key (ie. Taunt editor), But i'm not sure that would work. Also, if you were trapped in a poly, the soldat can't play animations, which is why /Mercy dosn't work, and you have to use /kill. This would be the same with /cyanide or whatever. Also, the soldat is to small to notice white froth coming from his mouth. Sorry, but I don't support this idea.