code: func (c *Callbacks) OnCUserMessageDesiredTimescale(fn func(*dota.CUserMessageDesiredTimescale) error) {
  	c.onCUserMessageDesiredTimescale = append(c.onCUserMessageDesiredTimescale, fn)
  }
docs: // OnCUserMessageDesiredTimescale registers a callback for EBaseUserMessages_UM_DesiredTimescale