I run a gmod ttt server, use ulx almost constantly. Since its used so much many people have found that you can set a key to use a command. For instance you can set the "\" key to use ulx slay, or "k" to use ulx teleport.
For whatever reason when ulx teleport is used in this manner, it do not echo. They also are not logged in ulx_logs. I've had an issue in the recent past where an admin was abusing ulx teleport by using this method and I couldn't prove it until he did it in front of me and admitted it.
It would help me as a server owner if these events echoed, showed up in the ulx_logs, or both.