Technology is being developed to control Avatars through thought waves tapped via electrodes attached to the scalp. Although yet to be commericialised or fully exploited, the technology is yet to perfect in controlling the online avatar. Although it is better than the keyboard version of controls.
Also web cams are being used to detect user motion and control avatars online. Lot of research is being carried out lately in the field of thought control and soon we would have a technology which would enable complicated data transfer to computer memory via imagination and thinking. With more research the accuracy and bandwidth of such data transfer methods is only going to increase in the coming days.